Accepttemporaryfailures, defertemporaryfailures Channel Options

Envelope recipient error handling
(New in MS 8.0.1.1.0.) The  and   source channel options control how recipient address temporary errors such as user over quota,  spam filter temporarily unavailable,  LDAP server unavailable,  and so on are handled by the SMTP server. is the default, and causes such errors to return an immediate 4yz error in the SMTP session. Setting  causes the address to be accepted, but the message will be placed in the  reprocess queue and retried until it either  times out and is  returned or the error clears.

These channel options are only intended for use on SMTP channels. Placing them on an internal channel may have unexpected results.

Compare with the   and   channel options.

See also:
 * acceptalladdresses Option
 * spamfilter1_optional MTA Option
 * Process and reprocess channels
 * Notification messages
 * Addresses channel options
 * Channel options