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421 Too many concurrent SMTP connections

Discussion in 'E-mail Discussion' started by Brook, Jan 31, 2009.

  1. Brook

    Brook Well-Known Member

    Apr 22, 2005
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    I keep getting an email saying:

    And sometimes when trying to send mail it fails with the same response.

    I seem to be gtting some IPs with over 20 connections:

    Some of the connections are from UK ISPs, so could some of our clients have a virus sending out mail? (Most are from places like Turkey and eastern Europe though).

    Any ideas what's going on? Is it safe to increase the number of connections allowed? If so how? And will that add loads to the server or pose any other risk?

    Thanks in advance!
  2. JPC-Shaun

    JPC-Shaun Well-Known Member

    Oct 29, 2008
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    This error symptom happens most likely because of Exim service has been stopped in on the server. The service was restarted automatically by the chkservd daemon in cpanel.

    You might want to sift through the log files in /var/log/maillog and /var/log/exim_mainlog. Also look under /var/log/ see why it is crashing though.
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