In general, you need to choose between a domain
form of address (gw@wash.dc.gov) and a UUCP form (wash!gw) and then go with
the delivery agent that makes the most sense for you. We recommend that you start
withth e most domain-correct agent, uucp-dom, and see if it works for you. If not,
scale back to uucp-uudom, then to uucp-new, and finally to uucp-old as a last resort.
17.6.1 uucp-old (a.k.a. uucp)
If you are running an old version of UUCP, you might have to use this delivery agent.
All addresses are turned into the ! form even if they were in domain form:
user becomes?†’ yourhost!user
user@host.domain becomes?†’ yourhost!host.domain!user
This delivery agent can deliver to only one recipient at a time, so it can spend a lot of
time transmitting duplicate messages. If at all possible, avoid using this delivery
agent.
17.6.2 uucp-new (a.k.a. suucp)
Newer releases of UUCP can send to multiple recipients at once. If yours is sucha
release, you can use the uucp-new delivery agent. It is just like uucp-old except that it
can perform multiple deliveries.
17.6.3 uucp-uudom
More modern implementations of UUCP can understand and correctly handle
domain-style addresses in headers (although they still require the ! form in the envelope).
If yours is such an implementation, you can use the uucp-uudom delivery agent.
At the receiving end, the message mail arrives with the five-character ???From ??? line
showing the sender address in the ! form.
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