North American Network Operators Group
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Re: SMTP no-such-user issues

  • From: Steve Bertrand
  • Date: Wed Jun 18 08:17:27 2008
Steve Bertrand wrote:
Hi everyone,

We are experiencing an issue in regards to SMTP MTA relay responses regarding 'no such user', and it *apparently* appears to be only occurring when a particular site attempts to deliver email to us.

For the sake of completeness...

The problem has been found within the defining of a variable in chkuser:

"But I found the problem. chkuser_settings.h shows:
#define CHKUSER_NORCPT_STRING "511 sorry, no mailbox here by that name (#5.1.1 - chkuser)\r\n"

I changed the 511 to 550 (as shown here http://www.faqs.org/rfcs/rfc821.html )"

I'm also told that version 2.09 of chkuser works around this problem.

For those who have recommended Postfix, I'd love to switch, however Qmail is tied so tightly into my mail infrastructure at this point that I don't think it would be possible without months and months of planning, and redeveloping a whole lot of internal management software.

Thanks everyone,

Steve