Noel Rivera wrote:

I'm new in this and I don't know to solve this problem

CHKUSER rejected sender: from <[email protected]::> remote <at64.mxbyrail.com:unknown:XX.XX.XX.XX> rcpt <> : temporary DNS problem

Thanks for HELP


Please turn off read receipts. It's considered rude to use them on a mailing list.
You have a DNS problem.
Can you give us more detail on what is transpiring?

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