[Mimedefang] mail server not issueing helo ro similar

[WBrown at e1b.org]

mimedefang-bounces at lists.roaringpenguin.com wrote on 01/18/2004 02:59:33 
PM:

> How common is it for MTA's to not send a:
> helo or etrn commnad?

Not very common for MTA.  This likely somtone/thing probing your network.
> 
> I see this in my logs:
> did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
> 
> Assuming you are using sendmail, will it even accept the mail if a valid
> helo or ehlo command is not received?

Nope.  try telnetting to your server on port 25. and issuing a mail from 
command.  It should complain that it  did not receive a HELO or EHLO 
first.

> What MTA server would be doing this?

None.
> 
> Can you reject on this?

What's to reject?