A common requirement is to distinguish between incoming personal mail and mail from a mailing list. The condition
is a shorthand for
$header_to: contains $local_part@$domain and $header_from: does not contain $local_part@$domain and $header_from: does not contain server@ and $header_from: does not contain daemon@ and $header_from: does not contain root@ and $header_subject: does not contain "circular" and $header_precedence: does not contain "bulk"
The variable "local_part" contains the local part of the mail address of the user whose filter file is being run -- it is normally your login id. The "domain" variable contains the mail domain. This condition tests for the appearance of the current user in the "To:" header, checks that the sender is not the current user or one of a number of common daemons, and checks the content of the "Subject:" and "Precedence:" headers.
If prefixes or suffixes are in use for local parts -- something which depends on the configuration of Exim (see section "Multiple personal mailboxes" below) -- then the first two tests above are also done with
instead of just `$local_part'. If the system is configured to rewrite local parts of mail addresses, for example, to rewrite `dag46' as `Dirk.Gently', then the rewritten form of the address is also used in the tests.
It is quite common for people who have mail accounts on a number of different systems to forward all their mail to one system, and in this case a check for personal mail should test all their various mail addresses. To allow for this, the `personal' condition keyword can be followed by
any number of times, for example
personal alias firstname.lastname@example.org alias email@example.com
This causes messages containing the alias addresses to be treated as personal.
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