Alternate addresses being rewritten

Why alternate addresses in the header are rewritten to the primary address?

It is expected that alternate addresses, in particular those that appear in a user&#x27;s    LDAP attribute, will be replaced by the MTA to whatever address appears in the user&#x27;s    LDAP attribute. While this replacement can be disabled by, say, using the   channel option,  this is inadvisable since the application of  address reversal is used for a variety of important purposes such as determing the proper  postmaster address to use to report errors.

The correct way to avoid this sort of rewriting is to store the alternate address in a    LDAP attribute instead of. Unlike,    addresses are not replaced (reversed) by the MTA.

See also:
 * ldap_alias_addresses MTA Option
 * ldap_primary_address MTA Option
 * noreverse Option
 * Intended side effects of LDAP address reversal
 * Postmaster addresses
 * ldap_equivalence_addresses MTA Option
 * Address reversal