Expected behavior
When impersonating a user, mail sending should work
Actual behavior
When impersonating a user, mail sending failed due to wrong supplied credentials (user in LDAP backend, IMAP login is attempted with admin password instead of user password => IMAP Srv refuse connection)
Mail app
Mail app version: 0.21.1
Mailserver or service: IMAP Srv selfhosted (dovecot)
Server configuration
Operating system: Ubuntu 18.04
Web server: Apache 2.4
Database: MariaDB 10.1
PHP version: 7.2
Nextcloud Version: Latest 17
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