The IMAP method allows user names with or without a domain part. For user names without a domain part, it still tries to access the (then non-existing) domain, resulting in "Error: Undefined array key 1 at .../nextcloud/apps/user_external/lib/IMAP.php#85" log messages.
Fixes #169
The IMAP method allows user names with or without a domain part. For user names without a domain part, it still tries to access the (then non-existing) domain, resulting in "Error: Undefined array key 1 at .../nextcloud/apps/user_external/lib/IMAP.php#85" log messages.