- Plesk 10.x for Windows
- Plesk 12.0 for Windows
- Plesk 12.5 for Windows
MailEnable mail is sent and received with a significant delays or looks like it is not sending at all.
SMTP Outbound queue is full.
%plesk_dir%Mail Servers\\Mail Enable\\Logging\\POP-DebugXXXX.logshows errors:
1/17/16 00:29:59 ME-E0125: Connection Refused: (203.0.113.2) was refused because the inbound connection limit has been reached.
11/17/16 00:29:59 ME-E0125: Connection Refused: (203.0.113.2) was refused because the inbound connection limit has been reached.
Server is saturated with spam.
Remove items from MailEnable white list at Plesk > Mail Server Settings > White list . Keep only
Increase maximum number of send threads in MailEnable console > SMTP > Properties > Outbound .
Increase maximum number of concurrent connections in MailEnable console > SMTP > Properties > Inbound > Advanced .
Rename SMTP queue folder or clear SMTP Incoming and Outgoing queues of spam messages. You may use the MailEnable KB-article .