Use permanent error MTA option

Error text and error interpretation MTA options:  (bitmask)
The  MTA option controls whether certain error conditions normally considered to be temporary are instead interpreted as permanent errors; that is, this option controls whether certain error conditions result in immediately bouncing (returning) messages instead of retaining them for further delivery retries. The option takes a bit encoded integer argument, with the individual bits each controlling an individual error condition. The default is 0.

The   channel option may be used on a per-source-channel basis to override the MTA level   setting.

Prior to the 8.0.1.2 release the MTA converts the "defer" mailUserStatus value to "inactive" internally when performing a reprocessing operation. This means that use of the rehostuser utility, which makes use of "defer", in conjunction with setting bit 0 (value 1) of  can cause messages received during a  rehostuser operation to be returned as undeliverable.

This issue has been addressed in 8.0.1.2 and later by having the MTA convert "defer" status to "hold" status instead.

IMPORTANT NOTE: More generally, various parts of Messaging Server, other Communications Suite components, and even external provisioning utilities assume that "inactive" status is used to indicate transient rather than permanent problems. As such, setting bit 0 (value 1) of  to cause a permanent error status to be returned is NOT RECOMMENDED.

See also:
 * Error text and error interpretation MTA options
 * error_text_inactive_user MTA Option
 * error_text_inactive_group MTA Option
 * error_text_over_quota MTA Option
 * error_text_alias_fileerror MTA Option
 * error_text_alias_fileexist MTA Option
 * error_text_recipient_over MTA Option
 * use_temporary_error MTA Option
 * usepermanenterror Option