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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