Email alerts not working with AD authentication

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Email alerts stops working when AD authentication is enabled. Eventlog gives the following error: Could not issue critical alert for rule 'Service up/down' to transport 'mail' Error: You must provide at least one recipient email address. This error is encountered on both my Librenms test boxes running Ubuntu 14.04 and 16.04.

Doing a test mail transport, it is able to send the test mail to all users in the AD group. Even with only one user being a member of the AD group, no alerts are sent.

The setup is the following: A "Networking" AD group contains three user accounts each with assigned email addresses.
In config.php, the following is added: $config['auth_ad_groups']['Networking']['level'] = 10;

Alerting settings: https://drive.google.com/open?id=0B8WCN9DjlJUca1pXajQxYXNGMlk
Alert capture: https://drive.google.com/open?id=0B8WCN9DjlJUcYkw4X3JMaUZFek0
Alert rules: https://drive.google.com/open?id=0B8WCN9DjlJUcNENsSGd6VWdDYTg

[bjorntimmer]

I've got exactly the same issue. When doing an alert capture it sees the mail addresses but it's not sending out the mails to the admins. Sending alerts to the syscontact is working.

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