I am having this weird issue where the email alerts will stop over time. First I had the fqdn in the mail server field (smtp.mydomain.local) and alerts were working fine. When I first noticed alerts weren't working I changed it to the IP address and it started working again. After a while it stopped working again and so I changed it back to the fqdn and it started working again. Anyone else experiencing this or know what could cause this to happen? It sucks that these alerts have become very unreliable for us.
We are running VCSA 6.5 (