Date: Thu, 14 Sep 2006 06:40:22 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Matthew Seaman <m.seaman@infracaninophile.co.uk> Cc: questions@freebsd.org Subject: Re: sendmail and hosts_access(5) Message-ID: <20060914034022.GD74348@gothmog.pc> In-Reply-To: <45083857.40405@infracaninophile.co.uk> References: <45082E5C.5040503@daleco.biz> <20060913163722.GA62734@gothmog.pc> <45083857.40405@infracaninophile.co.uk>
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On 2006-09-13 17:56, Matthew Seaman <m.seaman@infracaninophile.co.uk> 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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