Sending email from Vultr: outbound port 25 is blocked, relay on 587
Vultr blocks outbound port 25 by default (and 465/587 on some new accounts) and asks customers to use a third-party mail service. How to relay mail from a Vultr instance on 587/465/2525, and how to request unblocking.
Vultr outgoing mail server: none from Vultr — relay through smtp.queensmtp.com on 587, 465 or 2525.
Vultr SMTP settings at a glance
| Outgoing (SMTP) host | none from Vultr — relay through smtp.queensmtp.com on 587, 465 or 2525 |
|---|---|
| Ports & encryption |
587 — STARTTLS465 — SSL/TLS2525 — STARTTLS25 — — <em>(blocked by default; unblock via ticket with justification)</em> |
| Username | your relay SMTP username |
| Password | your relay SMTP password |
| Authentication | Vultr's policy blocks SMTP port 25 on new accounts; a ticket with a legitimate use case (and account age/history) may lift it. |
How to set up Vultr SMTP
- Configure the app or Postfix to relay via smtp.queensmtp.com:587 with STARTTLS and your credentials.
- If you must run a mail server, set rDNS in the Vultr panel and request port 25 via support.
Sending limits
- No mail service from Vultr.
Things that catch people out
- Vultr IP ranges appear on some blocklists (UCEPROTECT); a relay with its own reputation avoids that.
Common Vultr SMTP errors
| Server reply | Meaning | Fix |
|---|---|---|
Connection timed out (port 25) | Vultr block. | Relay on 587. |
More codes: 535 authentication failed, 550 relay denied, 554 rejected as spam, connection timed out — or all SMTP error codes.
When Vultr 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 your relay nowRelated settings
Vultr SMTP — questions
Yes, through an authenticated relay on 587/465/2525. Direct port-25 delivery is blocked by default.
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