Applicable to:
- Plesk Onyx for Linux
Symptoms
-
Some folders are missing in Outlook after mailbox synchronization
-
Checking mail in Thunderbird fails
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mail_max_userip_connections parameter in the Dovecot configuration is set to 10:
# dovecot -a | grep mail_max_userip_connections
mail_max_userip_connections = 10 -
Errors in
/var/log/maillog
:CONFIG_TEXT: dovecot: imap-login: Maximum number of connections from user+IP exceeded (mail_max_userip_connections=10): user=user@example.com, method=PLAIN, rip=203.0.113.2, lip=203.0.113.1, TLS, session=<NfqTTyFE4QAqPdEQ>
Cause
The maximum number of connections for a user has been exceeded.
Resolution
Increase the maximum number of connections to avoid synchronization errors:
-
Log into Plesk
-
Go to Tools & Settings > Mail Server Settings > Maximum number of connections for a user per IP address > increase the value and click OK
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