Hi
Outlook 2024 set via MAPI and Smartermail version v100.0.9546 using service record and choosing exchange account in outlook for domain test dot com which goes to SRV record https : // mymaindomain dot net (becuase I have three domains so I created an SRV record pointing to this and autodiscover SRV records of all the other domains pointing to this and it works no problem)

IMAP/POP3 is OK, EAS is OK, Web is ok but when MAPI the outlook windows asking for credential is repeated. Even if you enter password correct nothing happens. When you hit cancel, it works good or you see need password in bottom of outlook and you click it and it gets ok.
Another problem, I donno related or not, Outlook rules for instance moving emails from someone to a specific folder do not work automatically. When you run them manually they are good.

Let's add that IDS rules are disabled for this IP, Outlook cache in windows is cleaned. Profile is changed. no problem if you set EAS or IMAP/POP. Users can login using webmail, etc. Users are local in Smartermail not coming from any Domain and clients some are joined and some are not

Thanks