>would mean that "all" your users would have to set up their clients with a
>different SMTP server from their POP3/IMAP4 server.
again, this is the advantage of having different hostnames in DNS for
each service, rather than all services, myopically, behind mail.domain.com
pop.domain.com A ip.ad.re.ss
smtp.domain.com MX mail.domain.com
webmail.domain.com A ip.ad.re.ss
imap.domain.com A ip.ad.re.ss
mail.domain.com A ip.ad.re.ss
Initially, in the most simple setup, ip.ad.re.ss would be the same
ip, but as services like virus scanning machines, 3rd party webmail
servers, or dedicated mail gateways were provided by different
machines, only the ip's change, not the users' mail settings.
Len
http://BIND8NT.MEIway.com: ISC BIND 8.2.2 p5 installable binary for NT4
http://IMGate.MEIway.com: Build free, hi-perf, anti-spam mail gateways
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