Use temporary error MTA option

Error text and error interpretation MTA options:  (bitmask)
(New in MS 8.0) The  MTA option  controls whether certain error conditions normally considered to be permanent are instead interpreted as temporary errors; that is, this option controls whether certain error conditions result retaining messages for further delivery retries instead of immediately bouncing (returning) them. 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 to override the MTA level   on a per-source-channel basis.

See also:
 * Error text and error interpretation MTA options
 * error_text_disabled_user MTA Option
 * error_text_disabled_alias MTA Option
 * error_text_unknown_alias MTA Option
 * error_text_unknown_host MTA Option
 * error_text_unknown_user MTA Option
 * use_permanent_error MTA Option
 * usetemporaryerror Option