- Plesk for Linux
- Unable to send email from a Plesk server to example.com domain with the following errors in
CONFIG_TEXT: postfix/smtp: F1CE869AC4: to=<firstname.lastname@example.org>, relay=mail.example.com[203.0.113.2]:25, delay=42, delays=0.1/0.01/22/20, dsn=5.0.0, status=bounced (host mail.example.com[203.0.113.2] said: 550-Verification failed for <email@example.com> 550-No Such User Here 550 Sender verify failed (in reply to RCPT TO command))
- example.com exists in Plesk but it's mail service is handled on external server (it uses third-party mail service).
- The following bounce-back email may be delivered to the sender:
CONFIG_TEXT: Action: failed
Diagnostic-Code: x-unix; No Such User Here
Postfix mail server always trying to deliver a message locally first. Since example.com exists on a local server, Postfix is looking for a mailbox firstname.lastname@example.org locally without checking domain's external mail service.
- Login to Plesk
- Since mail service for example.com is handled by the third-party service, disable mail service in Plesk: Domains > example.com > Mail Settings > uncheck option Activate mail service on this domain
This way, Postfix will contact third-party mail service directly without checking if the mailbox exists in the local database.