Letters from the server do not reach mailboxes linked to Google Apps of the same domain

Question

Google Workspace

Such a thing. Mail on the domain works through Google Apps. Letters sent to these mailboxes from a site running on this domain do not reach. Emails are sent via PHP.

No explanation comes to mind. What can be wrong?

Answer 1

Maybe this will help: debian.pro/1139

Answer 2

The server probably thinks that the mail is on the same server and does not release it outside. I had this problem with cpanel. When I removed the mail domain from the panel, everything fell into place. perhaps you have something similar.