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Erroneous "Unsupported SMTP parameter (Data Size (> 20000000)) "

Hello,

We are running IOS12.4(5a) on a 2821 and have "ip inspect esmtp" enabled. We noticed that every day several emails end up in the postmaster account with

the following message:

"A mail message was not sent due to a protocol error.

500 Firewall Error

The message that caused this notification was:"

On closer inspection the router logfiles show:

Apr 20 08:54:19 loghost 830747: 810587: Apr 20 08:54:19.441 BST: %FW-3-SMTP_UNSUPPORTED_PARAMETER: Unsupported SMTP parameter (Data Size (> 20000000)) from initiator (172.16.1.6:3537)

But the emails in questions are just a few kB. So what is going wrong. This is especially disturbing because the users

don't get a notification that the email

has not been delivered.

Any ideas what is going wrong?

Thanks,

Doro

2 REPLIES
New Member

Re: Erroneous "Unsupported SMTP parameter (Data Size (> 20000000

12.4(5a) was very buggy on a 2811 I installed a while back. Took TAC around a week to put together code to keep the router from rebooting constantly, however it was related to IPS DNS signatures. I would definately recommend upgrading IOS first, also setup the following parameters, per TAC;

Here are the settings commonly suggests for customers:

ip inspect max-incomplete high 10000

ip inspect max-incomplete low 9000

ip inspect one-minute high 7000

ip inspect one-minute low 6000

ip inspect tcp max-incomplete host 250

New Member

Erroneous "Unsupported SMTP parameter (Data Size (> 20000000)) "

Hi,

Did you solve the problem?

We have the same situation on 2921 with c2900-universalk9-mz.SPA.151-4.M4.bin

Kind regards,

Michał

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