Error Notifications and SMTP Codes

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Ever wondered why your emails don't send or your email marketing campaign fails and all you're left with is something called an SMTP error code and a short.

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Wikipedia has a neatly arranged list of the codes. Probably after the 404 Error, this is the most common kind. We have all seen it sometime or the other when a mail is left undelivered or simply bounces. SMTP errors define the system.

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A server will respond with success (code 250), failure (code 550) or error (code 500, 501, 502, 504, or 421), depending on its configuration. An ESMTP server returns the code 250 OK in a multi-line reply with its domain and a list of keywords to indicate supported extensions. A RFC 821 compliant server returns error code.

May 3, 2014. This document describes the set of extended status codes for use within the SMTP mail system for delivery status reports, tracking, and improved diagnostics. In combination with other information provided in the Delivery Status Notification ( DSN) delivery report, these codes facilitate media and language.

SMTP and ESMTP Error Code List | InMotion Hosting – May 28, 2013. It is important to figure out why your email bounces. If you receive an email bounce, you can look in the bounce message to find the proper error code that will give you the reason for the bounce. Below is a list of the Standard SMTP error codes and the Extended SMTP (ESMTP) error codes.

Specification Required Chris Newman X.0.0 Other undefined Status Any Other undefined status is the only undefined error code. , but not permitted by the SMTP.

Simple Mail Transfer Protocol. This causes an error on the server when trying to send the 221 reply. RFC 3463 – Enhanced Status Codes for SMTP.

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Extended SMTP (ESMTP), sometimes referred to as Enhanced SMTP, A RFC 821 compliant server returns error code 500, allowing ESMTP clients to try either HELO or QUIT.

The responsibility of an SMTP client is to transfer mail messages to one or more SMTP servers, or report its failure to do so. The means by which a mail message is presented to an SMTP client, and how that client determines the identifier(s) (" names") of the domain(s) to which mail messages are to be transferred, is a local.

Learn what SMTP and ESMTP codes are in this article for email bounce diagnostics.

Greylisting is a method of defending e-mail users against spam. A mail transfer agent (MTA) using greylisting will "temporarily reject" any email from a sender it does not recognize. If the mail is legitimate the originating server will try again after a delay, and if sufficient time has elapsed the email will be accepted.

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