This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: alex.zan@alice.it host mx.tim.it [82.57.200.133] SMTP error from remote mail server after initial connection: 550 mail not accepted from blacklisted IP address [13.251.245.207] Alex.ZABBIA@MANE.com host mane-com.mail.protection.outlook.com [104.47.10.36] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [DB5EUR03FT057.eop-EUR03.prod.protection.outlook.com] alex.mathole@siemens.com host siemens-com.mail.protection.outlook.com [104.47.2.36] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. 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