Problem:
It have problem when connecting with IMAP services but it have response when try to do telnet test with port 143 or 993.
Symptoms:
Keeps have error found at Plesk maillog located at
/usr/local/psa/var/log/maillog
----
Oct 4 09:28:43 server courier-imaps: Maximum connection limit reached for ::ffff:11.22.33.44
Oct 4 09:28:43 server courier-imaps: Maximum connection limit reached for ::ffff:11.22.33.44
Oct 4 09:28:44 server courier-imaps: Maximum connection limit reached for ::ffff:11.22.33.44
Oct 4 09:31:48 server courier-imaps: Maximum connection limit reached for ::ffff:11.22.33.44
----
Caused:
It is because too many connection from single IP to mail server
Resolution:
Adjust the MAXPERIP in /etc/courier-imap/imapd
Default value is 4
and then restart the IMAP services by
#> plesk sbin mailmng-service --restart-service --mail-component
authdaemon --mail-component pop3 --mail-component pop3s --mail-component
imap --mail-component imaps
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