Greylisting & InterMail MTA?

John Sutton
Fri Mar 12 17:16:33 UTC 2004

Hi there

Here in the UK we have an ISP called NTL (or NTLI, I'm never quite sure).  
They are running these 8 SMTP clients:

which exhibit the following wonderful behaviour.  On receipt of a 452 at the 
end of the DATA transfer, they seem to treat that as a 250 - the message is 
never resubmitted nor does the sender receive a non-delivery DSN.  Good, huh?

Their SMTP server announces itself as:

InterMail vM. 201-229-121-137-20020806

and presumably this is the same vendor's code which is making such a hash of 
the client end.  Of course, I've grey_whitelisted the 8 ip's and have written 
to NTL (no response) but I would also like to write to Intermail but I can't 
track them down.

Anybody know anything about it/them?

John Sutton
SCL Internet
Tel. +44 (0) 1239 711 888

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