[changes]

[changes:de]

[bugfixes]
* Fixes error 554 5.2.252 when sending emails using `Office 365 (App-Only)` with multiple mailboxes.

[bugfixes:de]
* Behebt den Fehler 554 5.2.252 beim Senden von E-Mails über `Office 365 (App-Only)` mit mehreren Postfächern.

[security]

[security:de]

