In the last post, we told you what hard and soft bounces are, this post will help you know their different types.
General Bounce (GB) | If the bounce message is unclear and the email server is not able to deliver the email message, it is treated as soft bounces. Example: "Subject: Undeliverable mail" |
General Soft Bounce - (SB) | Email is not delivered to the recipient email address temporarily by the email server. Example: "Connection timed out." |
Soft Bounce - Dns Failure (SBDF) | Email is not delivered to the recipient email address due to a DNS problem. Example: "Host is unreachable" |
Soft Bounce - Mailbox Full (SBMF) | Email is not delivered to the recipient email address as the recipient's email box is full. Example: "Mailbox over quota" |
Soft Bounce - Message Size Too Large (SBMS) | Email is not delivered to the recipient email address because the message size is too large. Example: "Exceeded maximum inbound message size" |
Transient Bounce (TB) | Email is not delivered to the recipient email address temporarily, but it is still trying. Example: "Warning: message still undelivered after 4 hours. We will keep trying until message is 2 days old" |
Mail Block - Attachment Detected (MBAD) | In this case, the recipient's email server is blocking your email due to an attachment. Example: "552 Disapproved attachment" |
Mail Block - Relay Denied (MBRD) | This message indicates that the recipient's email server is blocking the email send by the sender’s email server. Example: "551 relaying denied" |
Non Bounce (NB) | This clarifies that the message could be a reply from the recipient and was not a bounce, or maybe an unknown bounce format. |
Mail Block - General (MB) | This message indicates that the recipient's email server is blocking the email send by the sender’s email server. Example: "550 Message REFUSED by peer" |
Mail Block - Known Spammer (MBKS) | Indicates that the recipient's email server believes you are a spammer and is therefore blocking your email. Example: "REJECT Known SPAM source" |
Mail Block - Spam Detected (MBSD) | Indicates that for the recipient's email server the message content appears like spam and is therefore blocking your email. Example: "550 Possible spam detected" |
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