A Bounce Message (English: reflect,), Delivery status Notification (DSN) back-throw message or briefly Bounce called, are an error message, which is produced automatically by a Mailserver, if a E-Mail is not deliverable.

This error message is sent to the undeliverable E-Mail by E-Mail to the sender (Envelope transmitter) and has even an empty Envelope transmitter (<>), in order to prevent Mail loops. As From: Address is used frequently the address MAILER-DAEMON@mailserver or POSTMASTER@mailserver.

One differentiates between Hardbounces, which result from permanent errors, for example if the E-Mail address of the receiver does not exist and Softbounces, which is produced for temporary problems, is exhausted for example if the Quota of the p.o. box of the receiver or the non removable disk fully.

Contents

A Bounce Message contains ith D." R. different references, those the sender of the undeliverable E-Mail help to find out, why its message was not deliverable. In addition belong

• Date and time, e.g. DATE: Mon, 20 June 2005 16:59: 51 +0200
• The Mailserver, which produced the error message, e.g. host mail.beisp.iel [192.168.111.222]
• The reason, for which the message was undeliverable, e.g. Does not exist to 550 this E-Mail address. sorry, NO mailbox here by that name (#5.1.1)
• The headers of the undeliverable E-Mail, e.g.

----- This is A CoPy OF the message, including all the headers. ----- Return path: <postmaster@mail.absen.der> Received: from postmaster by more mail.absen.der with local (Exim 4,41) ID 1DkNkc-000OXB-Ib; Mon, 20 June 2005 16:59: 50 +0200 DATE: Mon, 20 June 2005 16:59: 50 +0200 From: <postmaster@absen.der> tons: postmaster@mail.beisp.iel CC: *deleted* Subject: RH: testing Message ID: <20050620145950.GZ61818@mail.absen.der> References: <DIIE.000004250005303D@mail.x.y> <20050614161552.GU3604@mail.absen.der> MIME version: 1,0 content type: text/plain; charset=us-ascii content arrangement: inline in-Reply-tons: <20050614161552.GU3604@mail.absen.der> 

• The undeliverable message or their beginning

test - please reply. 

Causes

Frequent causes for Bounce Messages are incorrect addressing, filter or hardware problems, for example:

incorrect addressing

550 sorry, NO mailbox here by that name of 550 receivers unknown/E-Mail address recipient unknown 550 5.1.1 <SMTPchocolate_dai811013@ **** >"… User unknown 550 this E-Mail address does not exist. sorry, NO mailbox here by that name (#5.1.1) 

Filter

550 relay emergency permitted 550 5.1.8 Only registrated user of acres allowed ton use this system 550 Mail which identified as Spam 

Hardware problems

554 error writing message ton safe STORAGE; message could emergency stored tons of disk 

Temporary problems

451 Temporary local problem - please try later 451 VS14-RT5 mailbox bounce arrival guess/advise exceeds system limit (#4.2.2) to 450 <mail. X [X] >: Client host rejected: try again more later 

Associated RFCs

• RFC 3461 - Simple Mail Transfer Protocol (smtp) service Extension for Delivery status Notifications (DSNs)
• RFC 3463 - Enhanced Mail system status code
• RFC 3464 - At Extensible Message format for Delivery status Notifications

Articles in category "Bounce Message"

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Related Websites

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