Email Bounce Code Explanations
refer:http://help.sign-up.to/index.php/Email_Bounce_Code_ExplanationsSign-Up.to interpret email bounce codes in accordance with the RFC 3463- Enhanced Mail System Status Codes Memo. While most email serversfollow the same guidelines, some do differ, so explanations provided inthis document and within Sign-Up.to applications should be consideredan indication rather than an absolute truth.
Some email servers also send a brief explanation of the areaalong with the error code. Where this occurs, Sign-Up.to will show thisadditional information in the application. Due to the difference ininterpretation of the guidelines, this addition information may notalways agree with this documentation.
Bounce Codes
Codes are formed of three digits separated by periods. In the caseof bounce errors, the first digit of these codes is either a 4 or a 5.A four typically means a persistent but not necessarily permanenterror, where 5 is usually a permanent error. In the explanations below,Sign-Up.to treat errors beginning with 4 as soft, 5 as hard exceptwhere stated otherwise.
4.0.0 / 5.0.0Undefined persistent error. Unfortunately some systems onlyissue general warnings such as this. As these error messages are vague,we treat them as soft bounces.4.1.x / 5.1.xDestination address error, usually caused by a bad address.4.2.x / 5.2.xDestination mailbox error, usually caused by a quota limit orother rule/error on the recipient’s server. Sign-Up.to treat all theseerrors as soft bounces.4.3.x / 5.3.xDestination mail system error or misconfiguration.4.4.x / 5.4.xNetworking issues with intermediate or destination mail server.4.5.x / 5.5.xMail delivery protocol status. This can be caused by anynumber of factors, from delivery mail server protocol errors tointermediate network issues or delays.4.6.x / 5.6.xUnsupported media or message content error.4.7.x / 5.7.xSecurity or policy status has triggered an error. It’spossible that an aggressive anti-SPAM policy or undesirable previouscontent has caused the system to reject mail. Sign-Up.to treat these ashard bounces so as not to further aggravate the destination mailserver.Acknowledgements:
RFC3463 - http://www.faqs.org/rfcs/rfc3463.html
页:
[1]