Sieve setoperation extension

As of the 8.0 release, the MTA supports a private " " action in system-level Sieves. This nonstandard extension is available without any special capability declaration; no " " action is needed for its use. This extension is provided so that system-level Sieve filters can override the type of enqueue operation being performed. Note that this action can be performed on a per-recipient basis.

" " accepts a single string argument specifying the operation  type. The possible operation types are: "relay" "submit" "passthrough" "default" Note that since " " is a Sieve action, any effects it has only affect MTA behavior after Sieve evaluation. In particular, initial header fixups done on receipt of the header occur before Sieve evaluation and are therefore unaffected by this action. Only the   channel option affects initial header fixups.

Note that for the Sieve " " extension,  the MTA supports a private item   to discover a message&#x27;s existing operation mode.

See also:
 * conditionalpassthrough Option
 * passthrough Option
 * Sieve environment extension
 * Sieve supported extensions
 * Sieve filters