Interesting... Final-Recipient: rfc822; [email protected] Original-Recipient: rfc822;[email protected] Action: failed Status: 5.7.1 Remote-MTA: dns; mail.covisp.net Diagnostic-Code: smtp; 550 5.7.1 <mail3.protonmail.ch>: Helo command rejected: Mail for this TLD is not allowed ---------------------------------------------- message/rfc822
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