Naturally, a user should not have to be root to read mail, so on mailhost
there would be a further alias of root to the address of a normal user.
As a convention, the special name postmaster can also be that of the user who gets
duplicate copies of some bounced mail. This is enabled by using the PostmasterCopy
option (?§24.9.85 on page 1064) in the configuration file:
OPpostmaster ?†? pre-V8.7
O PostmasterCopy=postmaster ?†? V8.7 and above
define(`confCOPY_ERRORS_TO??, user) ?†? mc configuration (V8.7 and later)
To disable sending copies of bounced mail to a special user (perhaps to protect privacy),
omit this option from the configuration file.
Note that V8 sendmail does not send a copy of error mail to the postmaster if the
error mail includes a Precedence: header with a value less than zero, such as junk,
bulk, or list used by mailing lists.
Also note that some sites define this user as one who is always aliased to a filter program
in the aliases file. For example, if the PostmasterCopy option is declared as:
OPmail-errors ?†? pre-V8.7
O PostmasterCopy=mail-errors ?†? V8.7 and above
define(`confCOPY_ERRORS_TO??, mail-errors) ?†? mc configuration (V8.7 and later)
and the corresponding aliases file entry is declared as:
mail-errors: "|/etc/mail/filter postmaster"
a program filter can be designed that discards all common error messages, such as
mistyped addresses, and forwards what remains to postmaster.
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