Sending mail bounces back if the recipient is external to our network.

[Jason Maddern]

So I need to change the substitute_domain to blah.com so it matches our internal email addresses and the Zone to the same then get the exchange guys to create a mailbox with the vms_username@blah.com so it can be resolved?

[Joseph Huber_1 · Accepted solution]

Yes, the VMS setup will set the correct sender parameters for the mail domain part.

The user from address You have to agree with the mail/exchange manager: either You have mailboxes there for all VMS users in question,
or put all VMS users in a forwarding or alias list on the incoming mail gateway.
(I don't know how to do tyhat on an exchange server, I only know Linux mail setup).

[Joseph Huber_1]

and, third possibility, You can allow users on VMS to set their FROM: address to their exchange server name (if any) via
DEFINE TCPIP$SMTP_FROM "user@ourmaildomain"

Logical
TCPIP$SMTP_PROHIBIT_USER_HEADERS
must not result in TRUE to let users set their own From:

[Jason Maddern]

I have an outstanding call with the Exchange guy's here.
Thanks for all your help.

[Jason Maddern]

Thanks Again.