Hi everyone - I was wondering if there was a third party tweak to achieve this result.

My home network and wifi is through one ISP (call it X). My phone and associated 3G/4G/LTE is with another carrier (call it Y)

By default, my email is set to go through carrier Y (ie. [email protected]) and if I send emails through the wifi - through ISP X, carrier Y will reject it as I am relaying an email from one ISP to another.

What I want to do is to trick/tweak the iphone or ipad into sending any emails through the 3G/4G/LTE (carrier Y) when I am connected via wifi (using ISP X). I know this can be done by switching off the wifi, send email and then switch on the wifi. But this becomes a chore when you are hooked into free wifi or any other networks and you don't realise an email has been rejected.

Does a tweak/hack exist to do this?