emails are not sending on alerts

emails are not sending on alerts

Hello there,

I have problem with sending emails on Alerts. I have configured new Alert Profile which should sent syslog messages to mail server, by matching only Severity which is "Alert".Cisco ASA is actually sending syslog messages.  Mail server settings are configured properly because test mail messages are sending well. On Alert page I see generated Syslog but on Status it indicates Failure. 

On firewall I see many connection attempts from syslog server to mail server, but actual mail messages are not sent.

Do you have any ideas what can be problem?

                New to ADSelfService Plus?