MailSlurp is a transactional email service with API + SMTP and a delivery focus. It is solid for sending, with cost and dedicated infrastructure scaling with volume.
Verdict: MailSlurp is a capable transactional email API, though cost and delivery control improve only past the free tier.
Pros
REST API + SMTP relay, both
Deliverability and inbox placement focus
Webhooks for opens, clicks, bounces
Cons
Free tiers are small (100s/day)
Pricing scales up fast at volume
Shared IPs can hurt deliverability on cheaper plans
Top 10 MailSlurp Alternatives & Competitors in 2026 - G2
Top 10 MailSlurp Alternatives & Competitors in 2026 | G2
# Top 10 MailSlurp Alternatives & Competitors
...
While MailSlurp is a leading solution in Email Testing Software, it's frequently compared with similar tools that offer different strengths.
...
The best overall alternative to MailSlurp is Brevo, rated ~4.5 stars on G2 from 2607+ reviewers.
It is frequently praised for easy setup and email marketing.
Other well-known alternatives to MailSlurp are: - MailerLite – known for customer support and easy setup (G2 star rating ~4.6)
- AWeber – highly rated for email marketing and email management (G2 star rating ~4.2)
- Intuit Mailchimp Email Marketing – offers email marketing and easy creation (G2 star rating ~4.3)
- Reoon Email Verifier – best suited for teams that need accuracy and email verification (G2 star rating ~4.8)
...
Based on G2 review data, MailSlurp is most commonly used in industries like Email Testing Software, Email Marketing Software, Email Verification Software.
...
## Top 10 Alternatives to MailSlurp Recently Reviewed By G2 Community
MailSlurp Reviews 2026: Details, Pricing, & Features
# MailSlurp Reviews
**Vendor:** MailSlurp
**Category:** [Email Testing Software](https://www.g2.com/categories/email-testing)
**Average Rating:** 2.0/5.0
**Total Reviews:** 2
## About MailSlurp
...
## MailSlurp Pros & Cons
...
- Users appreciate the **ease of use** of MailSlurp, citing its functionality and templates that save them time.
(1 reviews)
- Users love the **templates** in MailSlurp, which simplify tasks and greatly enhance productivity.
(1 reviews)
**What users dislike:**
- Users find the **cost of MailSlurp high** and express a desire for more year-round promotions.
(1 reviews)
## MailSlurp Reviews
### 1. Excellent Functionality and Templates
**Rating:** 4.0/5.0 stars
**Reviewed by:** Verified User in Online Media | Small-Business (50 or fewer emp.)
...
**What do you like best about MailSlurp?**
Functionality and templates make my work easier and save me tons of time
**What do you dislike about MailSlurp?**
Price/Cost is high, and I wish there were more promotion,s especially all year round and not only black friday
**What problems is MailSlurp solving and how is that benefiting you?**
...
### 2. Good tool without customer service
**Rating:** 0.0/5.0 stars
**Reviewed by:** Verified User in Financial Services | Mid-Market (51-1000 emp.)
...
**Reviewed Date:** November 10, 2021
**What do you like best about MailSlurp?**
Simple and effective tool.
It does what they promise.
**What do you dislike about MailSlurp?**
No customer service available.
We have problems with the invoices and trying to remove our account and it was impossible to contact them by support page, email, social media or phone.
**What problems is MailSlurp solving and how is that benefiting you?**
We used MailSlurp to test our development without the need to setup an internal email service or similar and you can access all the features by APIs.
Read Customer Service Reviews of www.mailslurp.com
# MailSlurp Reviews
15
3.1
...
## All reviews
(15)
**7 reviews** in the last 12 months
...
## Wow, these people are terrible.
I signed up for a 7-day trial and was charged on what I believed was still the seventh day.
Since I never received a sign-up or trial confirmation email with the exact start and end time, I reached out to ask for clarification and requested the timestamp they were using to calculate the trial period.
Instead of receiving a professional explanation, I was met with rude and condescending responses.
After asking them to provide the trial timestamp, I received this reply:
"You're wasting all this time over $69 dollar - and you call yourself a creative agency.
What a loser.
You are now refunded and blocked.
Go away."
Whether their billing policy was technically correct or not, there is no excuse for speaking to a customer this way.
A simple explanation would have resolved the situation.
Instead, they chose insults and unprofessional behavior.
I ultimately received a refund, but only after being belittled for asking a reasonable question.
I cannot recommend a company that treats its customers with this level of disrespect.
...
Reply from MailSlurp
...
We are genuinely surprised by this review.
This account was reviewed and closed under our terms after usage concerns were identified, and the related charge was refunded.
We do not agree with the way this has been characterized.
We cannot discuss private account details publicly, but we stand by the account action and refund handling.
...
## Scammers: Account blocked, then charged, then excessive personal attack
After blocking my account for no reason, I was still charging me a $70 renewal fee a week later.
I emailed asking for a refund rather than go ahead and dispute.
I assumed that was a courtesy on my end (I should've just disputed), but I was instead attacked and told to "not threaten them again".
Final email from their side was too profane to quote here.
...
Reply from MailSlurp
...
We are genuinely surprised by this review.
This account was reviewed and closed under our terms after usage concerns were identified, and the related $69 charge was refunded.
We do not agree with calling this a scam or suggesting that funds were kept improperly.
We cannot discuss private account details publicly, but we stand by the account action and refund handling.
...
## Con Artists / Scammers
Subscribed to the Hobby Version because it was for hobby projects, randomly get a notification that they are upgrading me to "Pro" because it looks like I'm a business / commercial??
At this point I hadn't even used their service yet, now I'm randomly charged nearly 5x the original price of the subscription.
And the kicker is to dispute this they ask you to reply to a noreply notifications email.
Do not work with this fraud scam company based in Estonia where you cannot legally pursue them.
Update: They attempted to take down this reveiw for defamation and Trustpilot sided with me.
November 16, 2025
Unprompted review
Reply from MailSlurp
...
We are disappointed by this characterization.
The fact that Trustpilot did not remove the review does not validate the claim that MailSlurp is a fraud or scam.
This was a plan, usage, and billing enforcement issue handled under our terms.
We cannot discuss private account details publicly, but we strongly disagree with the fraud accusation and stand by our account review process.
...
## Extremely rude support, sudden account closure, no professionalism
I strongly advise you to stay away from MailSlurp.
They automatically upgraded my personal Starter plan to a Pro plan without asking me — just because my email domain looked “commercial”.
When I asked for a refund and explained that I paid personally, they didn’t fix anything.
Instead, they closed my account and refunded me with a message saying:
“You are too difficult for us to work with sorey.”
That’s not a joke.
That was their actual response.
This is by far the most unprofessional customer service I’ve ever seen.
If something goes wrong — you’ll be ignored or banned instead of helped.
...
We are sorry you were unhappy with the outcome.
Your account was reviewed under our plan and usage terms after commercial-use indicators were identified, and the account was refunded and closed.
...
## The worst Costumers service ever and…
The worst Costumers service ever and also they take my money they charge 340$ for nothing and they frozen my paid account i open multiple ticketwithout nothing
...
We are disappointed to read this characterization.
Account restrictions are only applied after review, including billing, usage, and acceptable-use concerns.
We do not agree that MailSlurp took money or charged for nothing.
We cannot discuss private account details publicly, but billing issues are reviewed through support and handled case by case.
...
## Poor customer service
Worst customer support ever!
Extremely rude!
My account got frozen a few days into trying out the product and spending hours implementing.
i submitting multiple tickets via the website using the link in the frozen account notification to no end i heard nothing for days. and when i finally got hold of them, they were extremely rude and proceeded to tell me the only way you can send emails is to switch to a paid plan, even though i was on a trial.
plan initially.
they immediately to proceeded to end the conversation abruptly without checking with me.
When i tried to reach out to them again to get some clarification about my issue, them immediately ended the new conversation again!
...
The account was reviewed under our usage and support policies, and action was taken based on the account history.
...
## Extremely rude support
Closing my account without prior notice, deleting all the amounts I paid.
Although my account did not have many requests.
...
My suggestion is to use similar services, MailSlurp is an irresponsible business.
Read Customer Service Reviews of www.mailslurp.com
# MailSlurp Reviews
15
3.1
...
## All reviews
(15)
**7 reviews** in the last 12 months
...
## Wow, these people are terrible.
I signed up for a 7-day trial and was charged on what I believed was still the seventh day.
Since I never received a sign-up or trial confirmation email with the exact start and end time, I reached out to ask for clarification and requested the timestamp they were using to calculate the trial period.
Instead of receiving a professional explanation, I was met with rude and condescending responses.
After asking them to provide the trial timestamp, I received this reply:
"You're wasting all this time over $69 dollar - and you call yourself a creative agency.
What a loser.
You are now refunded and blocked.
Go away."
Whether their billing policy was technically correct or not, there is no excuse for speaking to a customer this way.
A simple explanation would have resolved the situation.
Instead, they chose insults and unprofessional behavior.
I ultimately received a refund, but only after being belittled for asking a reasonable question.
I cannot recommend a company that treats its customers with this level of disrespect.
...
Reply from MailSlurp
...
We are genuinely surprised by this review.
This account was reviewed and closed under our terms after usage concerns were identified, and the related charge was refunded.
We do not agree with the way this has been characterized.
We cannot discuss private account details publicly, but we stand by the account action and refund handling.
...
## Scammers: Account blocked, then charged, then excessive personal attack
After blocking my account for no reason, I was still charging me a $70 renewal fee a week later.
I emailed asking for a refund rather than go ahead and dispute.
I assumed that was a courtesy on my end (I should've just disputed), but I was instead attacked and told to "not threaten them again".
Final email from their side was too profane to quote here.
...
Reply from MailSlurp
...
We are genuinely surprised by this review.
This account was reviewed and closed under our terms after usage concerns were identified, and the related $69 charge was refunded.
We do not agree with calling this a scam or suggesting that funds were kept improperly.
We cannot discuss private account details publicly, but we stand by the account action and refund handling.
...
## Con Artists / Scammers
Subscribed to the Hobby Version because it was for hobby projects, randomly get a notification that they are upgrading me to "Pro" because it looks like I'm a business / commercial??
At this point I hadn't even used their service yet, now I'm randomly charged nearly 5x the original price of the subscription.
And the kicker is to dispute this they ask you to reply to a noreply notifications email.
Do not work with this fraud scam company based in Estonia where you cannot legally pursue them.
Update: They attempted to take down this reveiw for defamation and Trustpilot sided with me.
November 16, 2025
Unprompted review
Reply from MailSlurp
...
We are disappointed by this characterization.
The fact that Trustpilot did not remove the review does not validate the claim that MailSlurp is a fraud or scam.
This was a plan, usage, and billing enforcement issue handled under our terms.
We cannot discuss private account details publicly, but we strongly disagree with the fraud accusation and stand by our account review process.
...
## Extremely rude support, sudden account closure, no professionalism
I strongly advise you to stay away from MailSlurp.
They automatically upgraded my personal Starter plan to a Pro plan without asking me — just because my email domain looked “commercial”.
When I asked for a refund and explained that I paid personally, they didn’t fix anything.
Instead, they closed my account and refunded me with a message saying:
“You are too difficult for us to work with sorey.”
That’s not a joke.
That was their actual response.
This is by far the most unprofessional customer service I’ve ever seen.
If something goes wrong — you’ll be ignored or banned instead of helped.
...
We are sorry you were unhappy with the outcome.
Your account was reviewed under our plan and usage terms after commercial-use indicators were identified, and the account was refunded and closed.
...
## The worst Costumers service ever and…
The worst Costumers service ever and also they take my money they charge 340$ for nothing and they frozen my paid account i open multiple ticketwithout nothing
...
We are disappointed to read this characterization.
Account restrictions are only applied after review, including billing, usage, and acceptable-use concerns.
We do not agree that MailSlurp took money or charged for nothing.
We cannot discuss private account details publicly, but billing issues are reviewed through support and handled case by case.
...
## Poor customer service
Worst customer support ever!
Extremely rude!
My account got frozen a few days into trying out the product and spending hours implementing.
i submitting multiple tickets via the website using the link in the frozen account notification to no end i heard nothing for days. and when i finally got hold of them, they were extremely rude and proceeded to tell me the only way you can send emails is to switch to a paid plan, even though i was on a trial.
plan initially.
they immediately to proceeded to end the conversation abruptly without checking with me.
When i tried to reach out to them again to get some clarification about my issue, them immediately ended the new conversation again!
...
The account was reviewed under our usage and support policies, and action was taken based on the account history.
...
## Extremely rude support
Closing my account without prior notice, deleting all the amounts I paid.
Although my account did not have many requests.
...
My suggestion is to use similar services, MailSlurp is an irresponsible business.
19 Best MailSlurp Alternatives (2026) - Tested & Ranked | Sequenzy
...
# 19 MailSlurp Alternatives Worth Considering
MailSlurp is a capable email testing API for developers and QA teams.
...
## MailSlurp Alternatives at a Glance
...
## 19 Best MailSlurp Alternatives
...
If you've been using MailSlurp and now need to actually send emails to real customers (not test inboxes), Sequenzy is the production-side complement.
...
Unlike MailSlurp, Sequenzy is designed for marketing and transactional delivery at scale, not testing.
...
Mailtrap is the most direct MailSlurp alternative - it started as an email testing tool and added production sending.
...
Resend is purpose-built for transactional email sending (password resets, receipts, notifications) with a developer experience that makes MailSlurp's sending API look dated.
...
If you've been using MailSlurp primarily for sending transactional emails (not testing), Resend is a more focused and developer-friendly option.
...
If you've outgrown MailSlurp's sending limits (5,000 outbound on Team plan) and need enterprise-scale delivery, SendGrid's infrastructure is battle-tested.
...
If you're using MailSlurp for transactional email sending and delivery speed matters, Postmark is the premium upgrade.
...
If MailSlurp's pricing at $207/mo for 5,000 outbound emails is too expensive for your volume, SES lets you send millions for a fraction of the cost.
...
For local development testing, it's simpler than MailSlurp's API-based approach.
...
Compared to MailSlurp's cloud-based API, Mailhog is simpler but more limited - no programmatic inbox access via SDK, no CI/CD integration out of the box, no multi-language SDKs.
...
Mailgun provides a similar developer-centric experience to MailSlurp for sending email, with SDKs in 7+ languages and comprehensive API documentation.
...
At $35/month for 50,000 emails on Foundation, the per-email cost for production sending is far cheaper than MailSlurp's outbound pricing.
...
If you've been using MailSlurp for sending and now need marketing capabilities, Brevo offers everything in one platform at an affordable price.
...
At $25/month for 20,000 emails, the per-email cost for production sending makes MailSlurp's $207/mo for 5k outbound look absurd.
...
MailerSend targets the same developer audience as MailSlurp's sending feature but with a cleaner, more modern approach.
...
At $28/month for 50,000 emails, production sending is dramatically cheaper than MailSlurp's outbound pricing.
...
If you're looking for MailSlurp alternatives because you've realized you need marketing email, not testing tools, ActiveCampaign is the automation powerhouse.
...
If your search for MailSlurp alternatives is because you're building an e-commerce business and need production email marketing, Klaviyo is the industry standard.
...
Completely different category from MailSlurp - this is production marketing, not testing.
...
If you're moving from development testing with MailSlurp to production marketing email, Mailchimp is the most recognizable name with the largest template library and integration ecosystem.
...
If MailSlurp's $207/mo for 5,000 outbound emails seems excessive for production sending, Elastic Email offers both transactional and marketing at a fraction of the cost.
At $0.09 per 1,000 emails after a free tier, the per-email cost is dramatically cheaper than MailSlurp for production volume.
...
MailSlurp is an email testing API.
...
MailSlurp's Team plan costs $207/mo for just 5,000 outbound emails.
...
MailSlurp's value is in CI/CD integration and programmatic SDK access.
...
|Feature|MailSlurp|Sequenzy|Mailtrap|Resend|SendGrid|Mailpit|
...
- You're switching from MailSlurp for testing
...
|MailSlurp use case|Best alternative|Why|
...
### Best MailSlurp alternative for email testing: Mailtrap, Mailpit, or Ethereal
...
Their Email Sandbox captures outgoing SMTP traffic and lets you inspect HTML, headers, spam score, and content - similar to MailSlurp's programmable inboxes but with a sandbox approach.
...
### Best MailSlurp alternative for SaaS email marketing: Sequenzy
If you searched for "MailSlurp alternatives" because you need to send marketing emails to real customers, you're looking for a completely different category of tool.
...
### Best MailSlurp alternative for transactional email: Resend, Postmark, SendGrid, or Amazon SES
...
### Best open-source MailSlurp alternative: Plunk or Mailpit
...
|MailSlurp|Strong|Limited and costly|No|QA teams that need programmable test inboxes.|
...
|MailSlurp Team|$207/mo for 5,000 outbound emails|$0.041|Fine for tests, poor for production delivery.|
MailSlurp vs HubSpot: Which Is Better in 2026? (Pros & Cons) | Sequenzy
MailSlurp is an email testing API for CI/CD.
...
- Primarily a testing tool
- Not for production email marketing
- Confusing pricing
- Limited sending reputation
...
### MailSlurp Reviews
Trustpilot
“yo nice speed improvement recene4tly and chat helped when invoice issue so that okay,”
Adam
Trustpilot
“I strongly advise you to stay away from MailSlurp.
They automatically upgraded my personal Starter plan to a Pro plan without asking me — just because my email domain looked “commercial”.
When I asked for a refund and explained that I paid personally, they didn’t fix anything.
Instead, they closed my account and refunded me with a message saying: “You are too difficult for us to work with sorey.”
...
MailSlurp reviews cited here highlight testing capabilities, API-based QA, and disposable addresses.
The limitation is that it is primarily a testing tool and not production email marketing.
