UNIX-to-UNIX Copy Program (UUCP) Mailers

If possible, avoid using UUCP. For an explanation, refer to http://www.sendmail.org/m4/uucp_mailers.html or do a search in /etc/mail/cf/README on this string: USING UUCP MAILERS.

UUCP defines these mailers.

uucp-old

Names in the $=U class are sent to uucp-old. uucp is the obsolete name for this mailer. The uucp-old mailer uses an exclamation-point address in the headers.

uucp-new

Names in the $=Y class are sent to uucp-new. Use this mailer when you know that the receiving UUCP mailer can manage multiple recipients in one transfer. suucp is the obsolete name for this mailer. The uucp-new mailer also uses an exclamation-point address in the headers.

If MAILER(smtp) is also specified in your configuration, two more mailers are defined.

uucp-dom

This mailer uses domain-style addresses and, basically, applies the SMTP rewriting rules.

uucp-uudom

Names in the $=Z class are sent to uucp-uudom. uucp-uudom and uucp-dom use the same header address format, domain-style addresses.

Because the smtp mailer modifies the UUCP mailer, always put MAILER(smtp) before MAILER(uucp) in your .mc file.