The disposition option.opt file

The  file is optional; in its absence, a reasonable set of (English language) default values will be used. (Indeed, the English language defaulting for the text controlled by this file is actually a bit more sophisticated than the handling available via the options in the file.) However, while its existence is not required, it is normally desirable to have such a file in non-English, language-specific directories. The  file supports the following options:

 SUBJECT
The SUBJECT option sets a default field value for the Subject: header line. The precedence is that any Subject: field value specific to the type of MDN -- for instance, a subject specified via a  Sieve  " " action---takes precedence over the setting of  the SUBJECT option. But the SUBJECT option in turn, when set, takes precedence over any Subject: field value set via the   flag in the    mapping  table, which in turn takes precedence over the default text shown in MDN types and their default Subject: field text.

RETURN_PERSONAL
When an MDN with a From: header address of the postmaster address is  being generated, (which note is not the case for all types of MDNs),  then the RETURN_PERSONAL option sets the so-called "personal name"  (technically, the RFC 822 "phrase") to use with the postmaster address.

TEXT_CHARSET
When generating a vacation MDN in  format, and not using   (so not supplying all MIME header lines and any necessary MIME encoding), the vacation reason text may need to have charset conversion performed. The TEXT_CHARSET option specifies the output charset.

See also:
 * MDN language and customization