unable to send mail through asa 5505

Unanswered Question
Nov 11th, 2009

hi all,

I am facing the following problem in cisco asa 5505 version 8 when clients are sending mails from inside to outside

a. Clients cannot able to send the mails to recipients ( say 200 ) at a time.

b. if they reduce the no: of recipients say 50 they can send

c. if we bypass the firewall they can able to send mail even to 4000 recipients at a time.

Can some help me on sorting out this issue

I have this problem too.
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Panos Kampanakis Wed, 11/11/2009 - 08:30

Check by doing "sh run policy-map" and "sho run service-policy", "sh run class-map".


francisco_1 Wed, 11/11/2009 - 09:47

The PIX/ASA has always been a bit wonky breaking SMTP left and right

when fixup smtp has been enabled. Have you tried troubleshooting with esmtp off?

francisco_1 Wed, 11/11/2009 - 09:49

The esmtp: This feature allows you to detect attacks, including spam, phising, malformed message attacks, and buffer overflow and underflow attacks. It also provides support for application security and protocol conformance, which enforce the sanity of the ESMTP messages as well as detects several attacks, blocks senders and receivers, and blocks mail relay. Sometime you're are better off with the feature off!

pranavam_dileep Wed, 11/11/2009 - 09:51


no , will it make any difference? client can send same mail to max: 50 users at a time.as the no: of recipient increases it is showing server disconnected

francisco_1 Wed, 11/11/2009 - 09:54

no harm turning it off to troubleshoot the problem! If problem persist you know is not firewall related!


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