[Observium] Issue with alert system

Hello

Since version Observium Professional 0.15.11.7200 I can't receive email alert. It worked until this version. My actual version: Observium 0.16.1.7533 (26th January 2016).

Here my simple alert checker (device down) [cid:image001.png@01D158F6.F24CBED0]

I can send and receive an email test with this command (so I exclude an issue with my mail server) root@xxxxxx:/opt/observium# php test_alert.php -a xxxxxxx

here the configuration of the contact: [cid:image004.png@01D158F7.61721D50]

And finally the screenshot of global settings: [cid:image003.png@01D158F7.ABC11820]

Can you please tell me what's wrong with the conf? Something is missing?

Many thanks for support Best

Aurélien