>When we built our Imail server a few years ago, all of our customers bought
>internet access thru us, so we limited who could send mail by only allowing
>a certain range of IP addy's to send / relay messages.
relay for addresses
>Since then we have sold that portion of our business, but most of the e-mail
>boxes stayed with us. Since their IP's changed, they now cannot send mail
>off of me. What I have been telling them is to call their local ISP and ask
>them for the SMTP information.
good idea. they should relay out through their access provider
>My question is, if I turn SMTP Auth on out of the blue, will that cause any
>noticeable effect to any of my customers that still CAN send e-mail off of
>me?
no effect really, they just won�t be able to send any mail. :))
>Will my customers have to change their e-mail clients if they are
>working fine now?
yes, go here: http://www.mailops.com, Robert Fehn�s most excellent site,
and click Help:SMTP AUTH for the gory details.
>What else can I expect?
Dealing with people, expect the worst, hope for the best ?
Len
http://MenAndMice.com/DNS-training
http://BIND8NT.MEIway.com : ISC BIND 8.2.4 for NT4 & W2K
http://IMGate.MEIway.com : Build free, hi-perf, anti-abuse mail gateways
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