with latest updates of z-push the send-as function in KOE with outlook has strange behaviour.
If selecting forward the mail with the mail opened in own window (double clicked mail) to internal user (to external adresses it works) - the mail is not sent and we get undeliverable reply from kopano spooler with message:
you are not allowed to send as user “nameofshareduser@internalFQDNofMailserver” but the address should be “nameofshareduser@externaldomainname”
If selecting forward on outlook ribbon without opening the mail in separate window (only in preview window) the mail is sent with correct shared sender address and is delivered through kopano-spooler without error
Server UCS 4.3-0 errata 11
z-push 2.4.1.beta1+3-0 (was also with 2.4.1.beta1+0-0) worked with version 2.4.0