Error sending e-mail to AT&T
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Dear Sirs,
When sending an e-mail message to ATT.net the mail is rejected with the following error:
Reporting-MTA: dns; smtp.vivaldi.net
X-Postfix-Queue-ID: DEB02BD04A
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Fri, 5 Feb 2021 16:13:31 +0000 (UTC)Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822; [email protected]
Action: failed
Status: 5.7.1
Remote-MTA: dns; al-ip4-mx-vip2.prodigy.net
Diagnostic-Code: smtp; 550 5.7.1 Connections not accepted from servers without
a valid sender domain.alph757 Fix reverse DNS for 31.209.137.12 -