- Plesk Onyx for Linux
Following symptoms can occur:
Unable to send mail from Plesk server with Postfix installed, SRS and smarthost enabled.
Mail forwarding does not work, the following error could be found in
CONFIG_TEXT: Sep 19 15:33:31 plesk01 postfix/smtp: 76EE4169874: to=<firstname.lastname@example.org>, relay=mx01.example.com [203.0.113.2]:587, delay=0.22, delays=0/0.01/0.14/0.06, dsn=5.0.0, status=bounced (host mx01.example.com [203.0.113.2] said: 550-Verification failed for <SRS0=mDmp=AUemail@example.com> 550-Previous (cached) callout verification failure 550 Invalid sender <SRS0=mDmp=AUfirstname.lastname@example.org> (in reply to MAIL FROM command)).
Unable to verify sender on the smarthost. The following error can be observed when trying to send mail via telnet:
# telnet 203.0.113.2 25
Trying 203.0.113.2 25...
Connected to 203.0.113.2 25. Escape character is '^]'.
220 12.mail.example.com ESMTP Postfix (Debian/GNU)
250 2.1.0 Ok
550 5.1.1 SRS0=htEj=4Wemail@example.com: Recipient address rejected: User unknown in virtual mailbox table quit 221 2.0.0 Bye Connection closed by foreign host.
- #PPPM-6317 "Fixed sender callback verification for forwarded emails with enabled SRS."
- Plesk Onyx 17.5 23 April 2018 (Linux)
If update is not possible for some reason you may try the following
Install the latest Plesk micro-updates.