MailerSend SMTP settings: smtp.mailersend.net, port 587
MailerSend SMTP relay: host smtp.mailersend.net, port 587 STARTTLS or 465 SSL, an SMTP user generated per domain in the MailerSend dashboard. Free tier and setup steps.
MailerSend outgoing mail server:
smtp.mailersend.net, port <code>587</code> (STARTTLS) or <code>465</code> (SSL/TLS) or <code>2525</code> (STARTTLS), username = the SMTP username generated under Domains → your domain → SMTP, password = the generated SMTP password.
MailerSend SMTP settings at a glance
| Outgoing (SMTP) host | smtp.mailersend.net |
|---|---|
| Ports & encryption |
587 — STARTTLS <em>(recommended)</em>465 — SSL/TLS2525 — STARTTLS |
| Username | the SMTP username generated under Domains → your domain → SMTP |
| Password | the generated SMTP password |
| Authentication | SMTP users are per verified domain; the From address must belong to that domain. |
How to set up MailerSend SMTP
- Domains → Add domain → add DNS records → verify.
- Domain → SMTP → Generate new user.
- App settings: host smtp.mailersend.net, port 587, STARTTLS, username/password = generated SMTP user.
Sending limits
- A small free tier (a few hundred to a few thousand emails per month depending on current plans) requires account approval; paid plans from about $28/month.
- Domain verification with SPF, DKIM and Return-Path CNAME required.
Things that catch people out
- New accounts are in "trial" with limited recipients until approved.
Common MailerSend SMTP errors
| Server reply | Meaning | Fix |
|---|---|---|
535 Authentication failed | Dashboard credentials used. | Generate an SMTP user for the domain. |
More codes: 535 authentication failed, 550 relay denied, 554 rejected as spam, connection timed out — or all SMTP error codes.
When MailerSend is not enough for your app
When a provider caps you or blocks a port, point the same app at QueenSMTP instead: host smtp.queensmtp.com, port 587 (STARTTLS) or 465 (SSL), your SMTP username and password from the dashboard. $5/year plus $0.10 per 1,000 emails, 100 free a day to test.
Get SMTP credentials — free to test Test MailerSend nowRelated settings
MailerSend SMTP — questions
smtp.mailersend.net on port 587 (STARTTLS) or 465 (SSL), with an SMTP user generated for your verified domain.
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