my other FREQ of the day

Julian Field mailscanner at
Mon Feb 17 11:02:14 GMT 2003

At 03:08 17/02/2003, you wrote:
>Though, for those who say "being and MTA is hard" -- what exactly is
>the queueonly sendmail doing that is hard to do?  It does access
>checking, which isn't very sophisticated.  Depending upon
>configuration, it checks that the sender's DNS and reverse DNS work.
>It does some relaying checks.  It decides about when to answer
>connection requests based upon the current load, and it throttles the
>connection based upon how many messages it's taking from a single host.
>  And it is looking at whether or not the queue disk is full.  What else?

It provides a fully-featured, reliable, robust, SMTP service. Anyone who
thinks that is simple has never tried writing anything of this sort
themselves. It's not a job I would like to attempt.
Julian Field
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