Heyo any mammothians in the house this late at night and want to throw on the sword and shield for me?
Basically a new VPS and migrated all WHM accounts from old vps (mammoth also).
New VPS = no emails sending to external domains from any account.
I have been plugging away for hours on this, finally bit the bullet and contact Cpanel Support.
They basically have checked the VPS firewall etc and everything appears to be fine... my thoughts
CPanel are claiming that the issue lies at the network level - something is blocking outbound port 25.
Left a support message @ mammothsvps.com.au
Cheers guys - You are always pretty awesome with any previous issues so thanks in advance!