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SMTP Error Code 501

The transaction failed permanently. The server will not try to send the message again. This is most commonly an issue with an incorrect/invalid email address.

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Email service providers

GMXAll GMX codes →

smtp;501 Syntax error in parameters or arguments

OrangeAll Orange codes →

smtp;501 5.1.0 Emetteur invalide. Invalid Sender. OFR004_405 [405]

OutlookAll Outlook codes →

smtp;501 5.1.3 Invalid address [outlook.com]

Low severity

QQAll QQ codes →

smtp;501 Bad address syntax. http://service.exmail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000730

Yahoo IncAll Yahoo Inc codes →

smtp;501 Syntax error in parameters or arguments

Other SMTP codes

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