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.
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