If your mail server is configured correctly this generally isn’t that big of an issue. You need a DKIM service on your mail server, and with that add some dns records (SPF records and DMARC) to the domain As long as those are in place and configured properly, you should be able to avoid most spam filters considering your domain invalid.
If your mail server is configured correctly this generally isn’t that big of an issue. You need a DKIM service on your mail server, and with that add some dns records (SPF records and DMARC) to the domain As long as those are in place and configured properly, you should be able to avoid most spam filters considering your domain invalid.