>I have iMail and Exchange 5.5 running in the same location (all users have 
>the same @domain.com but the Exchange box is actually corp.domain.com)

so each user has a mailbox imail @domain.com and another mailbox 
@corp.domain.com?  or does ex think it's domain is also @domain.com?

>  and I want the iMail box to forward emails destined for the Exchange 
> users.  Currently, I have to create an alias in iMail for each Exchange 
> user that points the @domain.com to @corp.domain.com.

you mean a forwarding rule?  an alias in imail would be

[EMAIL PROTECTED] with alias of [EMAIL PROTECTED]

That is still just one mailbox in Imail.  with forwarding by imail:

[EMAIL PROTECTED] gets fowarded to [EMAIL PROTECTED] That's two separate 
mailboxes on two separate mailbox servers, no aliasing. once the mail is 
delivered to an imail mailbox, it stops there. Exchange can't read it.

>  Is it possible to configure iMail to try the Exchange box instead of 
> creating these aliases?

Imail will only relay mail, as corp's primary MX host, to 
@corp.exchange.com if Imail doesn't have a domain (or aliases) 
@corp.domain.com.  The imail manual explains how to set Imail up for 
relaying (aka store/forward).  The suggested ETRN by exchange will work is 
exchange has a fixed ip but intermittant connection to internet.   if 
exchange is permanently connected, Imail will relay immediately all  @corp 
mail, no ETRN needed by exchange.

Len


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