Re: send e-mail without use sendmail

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Frank Cox 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 [email protected] doesn't work, but have never
really understood why...
Mail is a special case in DNS since most organizations want delivery to
be directed to a small number of servers, so the host/domain lookup
always tries to follow MX records. If you want to use a literal IP
address you have to enclose it in []'s to skip the MX lookup (and if you
are doing it on the command line, enclose in ''s because the []' are
shell metacharacters). mail '[email protected][]' will attempt a
connection, but the receiving system may still not like it.
  Les Mikesell
    [email protected]

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