[TriLUG] Sendmail errors

[Joseph Tate]

I'm getting the following in my logs daily, and with increasing 
regularity.  Is this something to be concerned about?  I'm almost 
positive it's spammers trying to find an open relay to use:

NOQUEUE: [61.185.93.45] did not issue MAIL/EXPN/VRFY/ETRN during 
connection to MTA
NOQUEUE: 112.Red-80-35-91.pooles.rima-tde.net [80.35.91.112] did not 
issue MAIL/EXPN/VRFY/ETRN during connection to MTA
NOQUEUE: adsl-068-153-179-091.sip.mia.bellsouth.net [68.153.179.91] did 
not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
NOQUEUE: [218.70.153.112] did not issue MAIL/EXPN/VRFY/ETRN during 
connection to MTA

What does this message really mean?

Joseph