At 09:58 AM 2/4/03 -0800, Stephen McHenry wrote:
>Does anyone have any idea why postfix is issuing different error codes for
>what appears (to me) to be the same error?
>
>Feb 3 17:31:50 bachelor postfix/smtpd[26775]: reject: RCPT from
>unknown[64.46.114.164]: 450 Client host rejected: cannot find your
>hostname, [64.46.114.164]; from=<sendermail4.unlist.net> to=<memchenry.net>
>Feb 4 01:13:48 bachelor postfix/smtpd[29512]: reject: RCPT from
>unknown[66.129.124.179]: 554 Client host rejected: cannot find your
>hostname, [66.129.124.179]; from=<mail2mail.play4keeps.com>
>to=<memchenry.net>
>
>The first one went out with a 450, the second with a 554. The 554 I can
>explain, since that's the

When there is a temporary DNS error, postfix will do the right thing and
return the 450 temporary error SMTP code. This allows the client to try
again later when DNS might be working again.

--
Noel Jones
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