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Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces. Learn more at 550 5.1.1 https://support.google.com/mail/?p=NoSuchUser f14si21367869plg.109 - gsmtp gzyigang@hotmail.com host hotmail-com.olc.protection.outlook.com [104.47.74.33] SMTP error from remote mail server after pipelined end of data: 550 5.7.1 Unfortunately, messages from [13.251.146.0] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [BN8NAM04FT054.eop-NAM04.prod.protection.outlook.com] gzwanao@hotmail.com host hotmail-com.olc.protection.outlook.com [104.47.74.33] SMTP error from remote mail server after pipelined end of data: 550 5.7.1 Unfortunately, messages from [13.251.146.0] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). 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[BN8NAM04FT054.eop-NAM04.prod.protection.outlook.com] gzgmecrsb@163.net host 163mx.cdn.163.net [106.3.156.151] SMTP error from remote mail server after RCPT TO:: 550 5.1.1 : Recipient address rejected: User unknown in virtual mailbox table gzttxgroup@ttxgroup.com host mxbiz1.qq.com [203.205.232.191] SMTP error from remote mail server after RCPT TO:: 550 Mailbox not found. http://service.exmail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000728 gzgl@esp.com.cn host mxbiz1.qq.com [203.205.232.191] SMTP error from remote mail server after RCPT TO:: 550 Mailbox not found. http://service.exmail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000728