What is the best way to set up a internal Unix sendmail server to relay ALL email to an internal Exchange server? Our vendor app uses sendmail to message local (unix) users and we need to be able to add our email domain to the username of the unix server. I hope this all makes sense...
Unix user = UnixName
Exchange Domain = companydomain.com.au
Local Domain = internal.loc
Unix Server FQN = UnixServer.internal.loc
Exchange Server = Exchange.internal.loc
We have an internal DNS server for internal.loc and all external DNS records are hosted off site with no zone in our local DNS.
The Exchange server is responsible for ALL internal and external messaging. The Sendmail server only generates the unix user messages and relays them to Exchange.
When a message is sent to UnixName from our vendor app, it is forwarded by Sendmail as UnixName@Exchange.internal.loc rather than UnixName@companydomain.com.au. Even if you manually enter UnixUser@companydomain.com.au it hits our Exchange server as UnixUser@Exchange.internal.loc. I do not want to have to create additional email profiles in Active Directory if I don't have to so I want all messaging from the Sendmail server to go out as @companydomain.com.au and NOT @Exchange.internal.loc...
I can work around this to some degree by adding a email address to a recipients AD profile in the format of UnixUser@Exchange.internal.loc but I do not want to have to maintain this manually. Unfortunately - you cannot create a recipient policy in Exchange for Exchange.internal.loc - it won't allow a smtp address policy that points to itself.
I've set up all the masquerading in the sendmail.cf file so that messages sent to external recipients from our vendor app will resolve via reverse DNS, I just have this one last piece to figure out. If I could get sendmail to send unqualified messages to UnixUser@companydomain.com.au, I'd be done with this!
Any help would be greatly appreciated!!!