On 2006-09-13 17:56, Matthew Seaman <[EMAIL PROTECTED]> wrote:
> hosts.allow triggers special behaviour with sendmail. Unlike other
> services which just close the connection immediately, with sendmail
> what happens is that it will accept the connection, let the sender
> attempt to send e-mail, but then respond with a 500 'permanent
> failure' code.
> The reason for that is fairly simple: if a MTA gets no answer when
> trying to connect to a server and deliver e-mail, then the standards
> say it should requeue the message and try again for up to 5 days. The
> only way to get the sending MTA to give up immediately is to issue a
> SMTP 500 error code.
Ah! I see now.
Thanks for taking the time to write this cool, detailed explanation.
Now I know one more thing about Sendmail :-)
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