In general, the first digit of the
SMTP code should match the first digit of the DSN status expression.
20.4.5 fax
Deliver with a fax-sending program V8.8 and later
The fax delivery agent is used to deliver mail to a fax-sending program. If you define this
delivery agent with:
MAILER(`fax??)
any address that ends in .fax is automatically sent to that delivery agent. Thus, to fax mail
to a user on the local machine, you might do the following:
To: joe@5554321.fax
This will cause the message to be sent to the faxmail program for delivery to the number
555-4321.* The faxmail program will parse the message for a recipient, and for fax-tuning
parameters passed in header lines that begin with x-fax-. It will format and send the result
to the hfaxd daemon, which actually communicates with fax modems.
Note that hfaxd and the modems need not exist on the local machine. If you have a central
fax server, you can set up all the client machines by defining the FAX_RELAY mc configuration
macro to point at that machine:
define(`FAX_RELAY??, `fax.your.domain??)
Withth is definition, any mail addressed to an address ending in .fax will be forwarded to
fax.your.domain for sending as a fax. Obviously, you will need to have fax-sending software
and fax modems installed on that machine.
Note that you should use either MAILER(fax) or FAX_RELAY??”not both.
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