>Should a virtual hosted client use my main mail server name as their SMTP
>server?

theirs

>Scenario:
>
>My IMail install on one server as mail.mydomain.com.
>
>Virtual Host SMTP server:  Should it be mail.mydomain.com or
>mail.theirdomain.com?

mail.theirdomain.com is their virtual mail host alias and

theirdomain.com is their mail host

In DNS:

theirdomain.com       MX     10 mail.ISPdomain.com
mail.theirdomain.com  MX     10 mail.ISPdomain.com

>Am I experiencing a bug?

Summmer is the bugful season, use some more repellant.

Len

Len
http://BIND8NT.MEIway.com: ISC BIND 8 installable binary for NT4
http://IMGate.MEIway.com:  Build free, hi-perf, anti-spam mail gateways

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