If you recently installed a patch/new version, try downgrading the binary or rolling back the upgrade.Check your resent configuration changes, and undo them (ini_yymmdd.rec is a copy of the config file each time it is modified, so you can use diff to find changes).Send the crash report or crash*.log file to Try disabling the virus scanner.Check startstop.log and mail.err for reasons/explanations.Check your ISP allows outgoing connections to the smtp port: telnet 25 (if it doesn't, ask them, they will usually allow it on request, or failing that you should use a g_gateway setting to send outgoing mail to an external mail server for delivery).Check your g_dns_host setting is pointing to a valid working dns server.Check the main log page in the we admin tool, look for the reason it gives for the failures.Check your router/firewall is letting port 25 into your server.Use an email test website to check your server:.Check your MX DNS entry points to your server:.Go to the 'log' page in the web admin tool, to see if your server is 'rejecting' the incoming email for some reason.Note: Most authent modules also allow extra options lie -debug to show more info.
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