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Sat, Dec 03, 2016 11:02 pm

Large number of procmail processes and failing POP3 connections

I was notified by a user that she was not able to check her email. After verifying that I could successfully establish a Telnet connection to the Simple Mail Transfer Protocol (SMTP) port, i.e., well-known port 25, which her system would use for sending email, I then tried establishing a Post Office Protocol version 3 (POP3) connection to the mail server from an external Microsoft Windows system, using Microsoft's telnet client. But that got stuck at "connecting to".
Microsoft Telnet> open 110
Connecting To

So I logged into the mail server, which is a CentOS 7 Linux server running Sendmail and Dovecot, and tried connecting to the localhost address,, but Dovecot never responded with a banner, nor did I receive any response when I issued a user command to provide login credentials. I had to hit Ctrl-] to exit from the Telnet program, since I wasn't getting any response from Dovecot.

# telnet 110
Connected to
Escape character is '^]'.
user lila
telnet> quit
Connection closed.

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