So I have a godaddy wildcard cert and I installed it and used the copied it via the buttons in SSL management.
This worked fine for months, but recently IMAP emails started timing out on sends.
I looked into it and I dont see many errors. The errors manifest themselves as Roundcube timing out on sends, or MS Outlook timing out on sends (with the message eventually sending)
Outlook sometimes throws:
Task ‘firstname.lastname@example.org - Sending’ reported error (0x8004210B) : ‘The operation timed out waiting for a response from the sending (SMTP) server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).’"
however that email eventually goes through.
roundcube sometimes throws a “timeout” too.
/var/log/mail.log shows nothing wierd
/roundcube/errors no errors
Well when looking at the logs initially it complained about a chain certificate error, so then I re-keyed it per the recommendation of Godaddy so yeah I dont know what to look at – the problem is it eventually does go in outlook, but roundcube not so much
I think you may have bingo on your card sir Jun 23 11:18:53 mail postfix/master: warning: service "submission" (587) has reached its process limit "100": new clients may experience noticeable delays
If it is, then you should find ways to contain the brute force attack; if not then your process limit of 100 is being reached due to valid use and you should consider increasing it, keeping in mind the corresponding increase in resources that will be required to serve a greater number of processes.