Conversion tags

The MTA has a private mechanism of conversion tags. Conversion tags may be set and used in a variety of ways and for a variety of purposes; besides the original use for triggering user-specific automatic documention conversion, another common use is for causing or influencing special routing of messages.

Note that conversion tags are stored in a private-to-the-MTA field in the message  envelope; they are not visible in received messages. (However, message conversion tags present on messages transitting the MTA will be included   in  MTA message transaction log entries  if the   MTA option is enabled.)

Conversion tags may be added via channel options,, via LDAP attributes ,  via an alias option  or  &#x5b;CONVERSION_TAG&#x5d; alias file named parameter, via  recipient access mapping tables  or the    mapping table,  or via the  Sieve conversiontag extensions. Conversion tags present on a message may influence certain mapping table operations (  mapping table,     mapping table,    mapping table when selected via ,  as well as various address mapping tables as controlled by the   MTA option),  and control matching and hence application of specific conversions entries. Complex effects due to, and manipulations of, conversion tags are also possible via Sieve conversiontag extensions.

See also:
 * include_conversiontag MTA Option
 * destinationconversiontag Option
 * sourceconversiontag Option
 * Conversion tag and service conversion channel options
 * MTA transaction log entry format
 * log_conversion_tag MTA Option
 * ldap_source_conversion_tag MTA Option
 * ldap_conversion_tag MTA Option
 * ldap_domain_attr_source_conversion_tag MTA Option
 * ldap_domain_attr_conversion_tag MTA Option
 * alias_conversion_tag Option
 * Alias file named parameters
 * CONVERSIONS mapping table
 * CHARSET-CONVERSION mapping table
 * Recipient access mapping tables
 * FROM_ACCESS mapping table
 * MESSAGE-SAVE-COPY mapping table format and examples
 * message_save_copy_flags MTA Option
 * deliveryflags Option
 * Sieve conversiontag extensions
 * Sieve filter manipulation of conversion tags
 * Message conversions