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[morganstanleylau]

Hi all,

I have the problem about the SMTP mail cannot be sent or cannot be received in Exchange Server, since , i upgrade to PIX firewall 2 weekly , user report a some of email can't received when change the PIX firewall, i have check the my SMTP log , found that all client can't received email those automatically put into badmail folder, however i find in microsoft.com,

http://support.microsoft.com/?kbid=895857

Microsoft say: 'To permit the SMTP commands that you require to reach your Exchange computer, you must turn off the SMTP command filter'

Anyone tell me how to permit in PIX access-list?

Thx

All the best,

Stanley

[mhussein]

Hello,

Cisco refers to this feature as "Mail Guard". When Mail Guard is enabled, ESMTP does not work, only basic SMTP commands work. To disable this feature and allow the exchange server to use ESMTP, issue this command:

no fixup protocol smtp 25

There is no need to change anything else on the access-list entry:

access-list acl_name permit tcp any host x.x.x.x eq smtp

Reference:

http://www.cisco.com/en/US/products/sw/secursw/ps2120/products_command_reference_chapter09186a00801727a8.html#wp1067379

Regards,

Mustafa

[morganstanleylau]

Hi mustafa,

I have already issue this command on my PIX, anyother advise? thx.

Stanley

[mhussein]

I am not sure if you need to "clear xlate" after disabling smtp fixup, and I can not think of anything else that may cause the problem.

Does this server send/recieve mail from/to the outside? does it have a static translation (as opposed to tcp port forwarding)? I't would be helpful if could provide information about how the server is positioned on the network and some config snippets.

[morganstanleylau]

Hi mhussein,

My exchange server 5.5 in inside interface and my Mail relay in DMZ interface, firstly client send email to us the mail relay will be receiver and than forward to exchange server, i have found that my mail relay server badmail folder see the email, i don't know why the smtp server block it,however user send the html format is not work, but in text format is work, i found it microsoft.com and found that the PIX have this problem, when fixup procotol turn on,

http://support.microsoft.com/default.aspx?scid=kb;en-us;320027

Finally, any expert can help me?

Stanley