Never seen it but isn’t that a case of recipient mailbox incorrect/no longer active?
From: mailop [mailto:[email protected]] On Behalf Of Stefan Bauer via mailop Sent: Friday, July 17, 2020 1:08 AM To: mailop <[email protected]> Subject: [mailop] host mx.tiscali.co.uk[62.24.139.42] said: 453 4.1.1 wJGljsu8zj2dp Recipient Lookup Failed (TT513) Hi, smtp Jul 17 07:50:52 mx2 postfix/smtp[31049]: 51CBC5EBE3: to=<[email protected] <mailto:[email protected]> >, relay=mx.tiscali.co.uk[62.24.139.42]:25, delay=9509, delays=9505/3/0.35/1.2, dsn=4.1.1, status=deferred (host mx.tiscali.co.uk[62.24.139.42] said: 453 4.1.1 wJGljsu8zj2dp Recipient Lookup Failed (TT513) (in reply to RCPT TO command)) According to the reply tiscali gives, they can not lookup the recipient. Anyone seen TT513? Thanks. Stefan
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