Re: [cobalt-users] MX Records and failover servers

[Jeff Lasman <jblists@xxxxxxxxxxxxx>]

"E.B. Dreger" wrote:

> IIRC, Sendmail 8.10.x was the first version that had a check_etrn
> rule built in.  Handy to prevent random people from trying to
> tickle the queue.

Eddy,

My own experience with ETRN is solely with Mailtraq, the Windows-based
email server for which I was formerly the Western Hemisphere
distributor.  I've no experience with sendmail ETRN; these days very few
mailservers don't have full time connections <wry grin>.  Mailtraq was
designed to be used as a mail server on a dialup connection; in Europe
and Great Britian (Mailtraq was originally developed in the UK) this was
a popular usage by the ISP "Demon".

I've always understood that ETRN was to a fixed IP# set up in the server
holding the mail, so I don't see why random people "tickling" the queue
would do more than create a minor annoyance.  Am I missing something? 
Is my understanding of how ETRN works a bit incomplete?

Thanks for your input.

Jeff
-- 
Jeff Lasman <jblists@xxxxxxxxxxxxx>
Linux and Cobalt/Sun/RaQ Consulting
nobaloney.net
P. O. Box 52672, Riverside, CA  92517
voice: (909) 778-9980  *  fax: (702) 548-9484