[sgsllc]

Hello all,

I have been running an email server for about 20 years. I have DNS configured with a text SPF record, reverse DNS is set up, and the mx records point to the correct mail servers. My IP address and domain name are not listed on any RBLs nor has the server ever been used to send unsolicited emails.

However, one large email provider also sends email originating from my server to spam. I am able to look at the headers of the messages and I do not see where any issues are detected.

Any ideas? I am willing to pay for time if you have any expertise in DNS and email server set up.

Thank you.

Justin