Different behavior with K9-Mail?

NethServer Version: 7.7

I get a different behavior on K9-Mail… One Phone is showing me the sent mails, the other Phone not ???

On the Nethserver:

This seems to be an open issue:

Hi, OK maybe this is the problem. I found an alternativ E-Mail Client called FairEmail

Did you combine FairEmail with any other software for contacts and calendar?

No, because I know it just abt an hour…

Maybe it’s not like you want it (not GPL) but… works quite well and until now it’s consistent.