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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 q7si22530889pfk.88 - gsmtp 2017cqxx@vip.cqut.edu.cn host mxbiz1.qq.com [203.205.232.191] SMTP error from remote mail server after RCPT TO:<2017cqxx@vip.cqut.edu.cn>: 550 Mailbox not found. http://service.exmail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000728 20051022062342.6FF886DC34@mail.saasta.ac.za host mail.saasta.ac.za [196.21.206.98] SMTP error from remote mail server after RCPT TO:<20051022062342.6FF886DC34@mail.saasta.ac.za>: 550 5.1.1 <20051022062342.6FF886DC34@mail.saasta.ac.za>: Recipient address rejected: User unknown in local recipient table 20240759@student.nwu.ac.za host utl-lnx2.nwu.ac.za [143.160.36.152] SMTP error from remote mail server after RCPT TO:<20240759@student.nwu.ac.za>: 550 5.0.0 <20240759@student.nwu.ac.za>... User unknown 20076223@student.nwu.ac.za host utl-lnx2.nwu.ac.za [143.160.36.152] SMTP error from remote mail server after RCPT TO:<20076223@student.nwu.ac.za>: 550 5.0.0 <20076223@student.nwu.ac.za>... User unknown 200099.cwaru@vodamail.co.za host mx1.vodamail.co.za [196.11.146.148] SMTP error from remote mail server after RCPT TO:<200099.cwaru@vodamail.co.za>: 550 5.1.1 <200099.cwaru@vodamail.co.za>: Recipient address rejected: User unknown in local recipient table 1sclaremont@gmail.com host gmail-smtp-in.l.google.com [172.217.194.27] SMTP error from remote mail server after RCPT TO:<1sclaremont@gmail.com>: 550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces. 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