send e-mail without use sendmail

Bob Marcan bob.marcan at
Fri Nov 2 10:56:48 UTC 2007

Ed Greshko wrote:
> Frank Cox wrote:
>> On Wed, 31 Oct 2007 12:05:11 -0500
>> Les Mikesell <lesmikesell at> wrote:
>>> You must have a real domain name to send email. 
>> Is there any technical reason (other than "we hate spammers") why email can't
>> be sent to an IP address instead of a domain name?
>> I know that mail sent to joeblow at 123.456.789.001 doesn't work, but have never
>> really understood why...
> It is call "fault tolerance".  In general, sending to a single IP address is
> has a single point of failure.  If that system is doesn't move.
>  When you send to there is what is known as an MX record that
> returns all the IP addresses that accept email for and weights
> for the sending side to decided who to sent to first and failing that
> second, etc.
> Sending to IP addresses doesn't scale and isn't manageable.

joeblow@[123.456.789.001] does work.

  Bob Marcan, Consultant                mailto:bob.marcan at
  S&T Slovenija d.d.                    tel:   +386 (1) 5895-300
  Leskoskova cesta 6                    fax:   +386 (1) 5895-202
  1000 Ljubljana, Slovenia              url:

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