sendmail gurus!!

Can any of you sendmail gurus help me out?

When I see this entry in my maillog, what are all the possibilities as to why this failure occurred? I understand that it could be a network or protocol failure, but any more specifics or ideas would help.

did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA


Thanks in advance

 

 

 

 

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