Watchguard V10 User Manual page 327

Masquerading tab
This tab allows you to masquerade domain names and
message-IDs for outgoing SMTP messages.
Masquerading domains allows you to present all email as
if it originates from a single domain. Masquerading mes-
sage-IDs allows you to replace the message-ID SMTP
Header with new IDs.
Domain Name
Firebox Vclass User Guide
Type a domain name here to replace the domain
names for outgoing messages with the specified
domain. For example, if you type
"watchguard.com," then all messages originating
from your network will appear to originate from
"username@ watchguard.com."
Proxy Parameters Reference
295