November 1, 2020

Out Here In The Fields

…of musings and ramblings

Email problem on Blackberry, Exchange 2003, and Cisco ASA,

1 min read

My mail server has been experiencing strange problem. Emails sent from gmail and yahoo via blackberries failed to reach its intended recipients. Gmail and Yahoo mailer daemons would complain about connection timeout, and and then give up. My Trend Micro IMS antispam server log showed that google server initiated a session, but nothing happened after that. Whitelisting and increasing session timeout didn’t help.

I did notice unusual behaviour when telneting other SMTP servers from my mail server:

surfer@Mach5-M:~$ telnet smtp.cbn.net.id 25
Trying 210.210.145.16...
Connected to smtp.cbn.net.id.
Escape character is '^]'.
220 *********************
ehlo there
500 #5.5.1 command not recognized

This is due to our mail server sitting behind a Cisco ASA, and our network guy activating “inspect” on smtp traffics. After disabling “inspect” on the ASA with

# no inspect esmtp

email sent from gmail and yahoo via blackberries run normally and can be delivered to its target.

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