What causes mails to get striked-over only, and not deleted?

[Robert L Mathews]

On 5/22/20 4:01 PM, Sebastian Nielsen wrote:
> and this sieve file (sent.sieve):
> 
> discard;
> 
> This should clearly cause the mail to be deleted right?
> But whats happen, is that the mail is not deleted, its just marked for
> deletion (gets a strike-through in Microsoft Outlook).

That means the message has had its "\Deleted" flag set, which is what
the discard command does:

https://tools.ietf.org/html/rfc6785#section-3.5

But the mailbox has not been "expunged". You probably want to set
"imapsieve_expunge_discarded=yes"; see:

 https://github.com/dovecot/pigeonhole/blob/master/doc/plugins/imapsieve.txt#L125


-- 
Robert L Mathews, Tiger Technologies, http://www.tigertech.net/