Well, the NOQUEUE is your first clue. A valid mail sender would issue the
mail command to initiate the message.
On Fri, 2 Mar 2001, Matt Kaminer wrote:
> I get about 10 of these every day in my maillog. How do I know it is not
> from a legitimate sail sender?
>
> NOQUEUE: [207.42.187.2] did not issue MAIL/EXPN/VRFY/ETRN during connection
> to MTA f21CiAY22865: ruleset=check_relay, arg1=[207.42.187.2],
> arg2=207.42.187.2,relay=[207.42.187.2], reject=553 5.3.0 Mail from
> 207.42.187.2 rejected;see http://www.mail-abuse.org/rss/NOQUEUE:
> [207.42.187.2] did not issue
>
>
>
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