An error occurred when sending mail: The mail server sent an incorrect greeting

Created:

2016-11-16 12:59:03 UTC

Modified:

2017-04-24 11:14:44 UTC

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An error occurred when sending mail: The mail server sent an incorrect greeting

Applicable to:

  • Plesk for Windows

Symptoms

Unable to send mail, the following message appears:

An error occurred sending mail: The mail server sent an incorrect greeting:  * OK IMAP4rev1 server ready at 12/05/13 12:52:52.

Cause

The submission port 587 also configured as alternative port for IMAP:

# telnet smtp.example.com 587
Trying 203.0.113.2...
Connected to smtp.example.com.
Escape character is '^]'.
* OK IMAP4rev1 server ready at 12/05/13 12:31:59

Resolution

Disable the alternate port:

MailEnable Management > Servers > localhost > Services and Connectors > IMAP (right click) select properties > Also listen on alternate port
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