Domain to IP Lookup Not Working

So I’m still a little new to IPFire and I’m using 2.25/141. I’ve entered all of my dynamic DNS information and my domains are green in color and it looks like all of the settings are correct. However, when I use MX Lookup using my cellular service (off my wireless network), my IP address is not returned. I checked my DynDNS account and my correct IP address is shown. Any ideas on what might be causing this?