Google cloud cm intences not sending mail to users
Solution 1:
Looks like your problem is that Google Cloud blocks email sending by default on port 25. You need a smart host to fix this. Read the articles below for further information:
https://support.cpanel.net/hc/en-us/articles/360041074753-Why-is-port-25-blocked- https://support.cpanel.net/hc/en-us/articles/360053203653