Google Apps + Mailgun Split Delivery

Question

This is a question that was asked a while ago on Server Fault , but was never really answered.

I have attempted to follow multiple guides, however, every single time I test it out I get

The error that the other server returned was: 550 5.7.1 Relaying denied

Does anyone have any advice on using Mailgun to achieve split delivery for Google Apps?

Answer 1

The way I do it, is setup a subdomain that has the mx records set to point at mailgun, then on the main domain, any addresses I want to go to mailgun I setup to forward to the subdomain

so say I want website@example.com to go to mailgun, i set this to forward to website@mailgun.example.com

You just need to make sure your code swaps out @mailgun.example.com with @example.com in the to fields if that matters to what you are doing

Hope that helps