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Bounce message
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Although the SMTP is a mature technology, counting more than forty years, its architecture is increasingly strained by both normal and unsolicited load.[2] The email systems have been enhanced with reputation systems tied to the actual sender of the email, with the idea of recipient's email servers rejecting the email when a forged sender is used in the protocol.[3] “Briefly, the total bounce rate is calculated as the sum of the hard bounce rate and soft bounce rate.” Hard bounces are permanent and they score higher in terms of sender's IP damage. Hard bounces occur when the sender's mail server determines that there is a high likelihood that the recipient is unavailable and is likely to remain so. A few of the occasions when hard bounces occur are when the recipients of the email find themselves in one of the following situations: incorrect identifier/incorrect domain (such as a typo in the email address or in the domain) or their server does not accept emails anymore. In this case, removal of the email addresses that bounce back is mandatory.
From Wikipedia, the free encyclopedia “A bounce message or just "bounce" is an automated message from an email system, informing the sender of a previous message that the message has not been delivered (or some other delivery problem occurred). The original message is said to have "bounced".” This feedback may be immediate (some of the causes described here) or, if the sending system can retry, may arrive days later after these retries end.
A bounce message or just "bounce" is an automated message from an email system, informing the sender of a previous message that the message has not been delivered (or some other delivery problem occurred). The original message is said to have "bounced". “This feedback may be immediate (some of the causes described here) or, if the sending system can retry, may arrive days later after these retries end.” More formal terms for bounce message include "Non-Delivery Report" or "Non-Delivery Receipt" (NDR), [Failed] "Delivery Status Notification" (DSN) message, or a "Non-Delivery Notification" (NDN).[1]
This feedback may be immediate (some of the causes described here) or, if the sending system can retry, may arrive days later after these retries end. “More formal terms for bounce message include "Non-Delivery Report" or "Non-Delivery Receipt" (NDR), [Failed] "Delivery Status Notification" (DSN) message, or a "Non-Delivery Notification" (NDN).” Although the SMTP is a mature technology, counting more than forty years, its architecture is increasingly strained by both normal and unsolicited load.[2] The email systems have been enhanced with reputation systems tied to the actual sender of the email, with the idea of recipient's email servers rejecting the email when a forged sender is used in the protocol.[3]
Although the SMTP is a mature technology, counting more than forty years, its architecture is increasingly strained by both normal and unsolicited load.[2] The email systems have been enhanced with reputation systems tied to the actual sender of the email, with the idea of recipient's email servers rejecting the email when a forged sender is used in the protocol.[3] “Both of them affect the IP reputation of the sender because the Email Service Providers (ESPs) consider the total bounce rate as a decision factor when directing the email into a user's Inbox.” Hard bounces are permanent and they score higher in terms of sender's IP damage. Hard bounces occur when the sender's mail server determines that there is a high likelihood that the recipient is unavailable and is likely to remain so. A few of the occasions when hard bounces occur are when the recipients of the email find themselves in one of the following situations: incorrect identifier/incorrect domain (such as a typo in the email address or in the domain) or their server does not accept emails anymore. In this case, removal of the email addresses that bounce back is mandatory.
Although the SMTP is a mature technology, counting more than forty years, its architecture is increasingly strained by both normal and unsolicited load.[2] The email systems have been enhanced with reputation systems tied to the actual sender of the email, with the idea of recipient's email servers rejecting the email when a forged sender is used in the protocol.[3] “Briefly, the total bounce rate is calculated as the sum of the hard bounce rate and soft bounce rate.” Hard bounces are permanent and they score higher in terms of sender's IP damage. Hard bounces occur when the sender's mail server determines that there is a high likelihood that the recipient is unavailable and is likely to remain so. A few of the occasions when hard bounces occur are when the recipients of the email find themselves in one of the following situations: incorrect identifier/incorrect domain (such as a typo in the email address or in the domain) or their server does not accept emails anymore. In this case, removal of the email addresses that bounce back is mandatory.
Had the library.example mail server known that the message would be undeliverable (for instance, if Jill had no user account there) then it would not have accepted the message in the first place, and therefore would not have sent the bounce. Instead, it would have rejected the message with an SMTP error code. This would leave Jack's mail server (at store.example) the obligation to create and deliver a bounce. “Auto-responses (automatic replies) are mails sent by a program—as opposed to a human user—in reply to a received mail and sent to the bounce address.” Examples of other auto replies are vacation mails, challenges from challenge-response spam filtering, replies from list servers, and feedback reports. These other auto replies are discussed in RFC 3834: auto replies should be sent to the Return-Path stated in the received mail which has triggered the auto reply, and this response is typically sent with an empty Return-Path; otherwise auto responders could be trapped in sending auto replies back and forth.[citation needed]
Bounces are a special form of autoresponder. Auto-responses (automatic replies) are mails sent by a program—as opposed to a human user—in reply to a received mail and sent to the bounce address. “Examples of other auto replies are vacation mails, challenges from challenge-response spam filtering, replies from list servers, and feedback reports.” The Return-Path is visible in delivered mail as header field Return-Path inserted by the SMTP mail delivery agent (MDA) (which is usually combined with a mail transfer agent, or MTA). The MDA simply copies the reverse path in the SMTP MAIL FROM command into the Return-Path. The MDA also removes bogus Return-Path header fields inserted by other MTAs; this header field is generally guaranteed to reflect the last reverse path seen in the MAIL FROM command.
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