The sending domain must have a valid MX or A record

General Email Routing
1

What is the name of the domain?

payrollconnected.com

What is the error number?

550 5.2.0

What is the error message?

The sending domain must have a valid MX or A record

What is the issue you’re encountering

I’ve made no changes to my MX or A records, and now suddently I’m getting my emails blocked by receiving servers

What steps have you taken to resolve the issue?

Verified the IP address hasn’t changed. Verified the MX and A records still exist.

What are the steps to reproduce the issue?

Have [email protected] send an email

Screenshot of the error

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Untitled.png1600×900 158 KB

2

You do have a proxied A record and an MX record for your domain…
https://cf.sjr.dev/tools/check?56dbe573b9cb46699e9273a3a22f143e#dns-mail

The MX record is being unproxied by Cloudflare as it points to your domain name so your MX record is returned starting _dc-mx. Try setting the MX record to point to mail.payrollconnected.com to avoid this and see if that helps, although I’ve not seen it causing an issue before.