In the real world, a high bounce rate leads to very unpleasant consequences that every marketer should be aware of:ġ. This directly impacts the deliverability of future email messages the marketer will send.Ģ. They indicate that the sender uses bad list acquisition and/or list management practices and sends unwanted or irrelevant messages. The most important types of bounce emails that should be addressed are hard bounce and abuse/fraud feedback reports.
Soft and transient bounce are ok until they turn into hard bounce ones. A lot of “blocked” emails is a sign that you should check your email program and pay attention to the message content and your sending IP/domain. “Blocked” bounce emails and feedback reports are helpful in terms of understanding how the recipients treat your mailings. They can be ignored and deleted from the mailbox. There are “harmless” bounce messages such as challenge-response or auto-reply ones. It is an automatic response from the recipient.ĭifferent types of bounce emails impact email deliverability differently. Generally, the confirmation is completed manually by clicking on a link within the Challenge-Response message itself.Ĩ. It is an automatic response from the recipient, requesting that the sender confirms a real person is sending the message. But if the failure persists, the transient bounce could be considered a hard bounce.ħ. Transient bounce emails do not require any action from the user. It indicates that the mail server temporarily can not deliver the message, but it is still trying. This is an email message sent to the sender by the ISPs’ feedback loops in case when a recipient clicks “This is spam/Report spam” on the message.Ħ. It indicates that the recipient’s mail server blocks the email from the sender’s mail server because it believes the sender is a known spammer, or the sender’s IP/domain is blacklisted, or the email message contains a suspicious attachment, or the message appears to have content that looks like spam or inappropriate links, etc.ĥ. It indicates that the mail server could not deliver the email message, but the reason is unclear.Ĥ. Check out our SPF soft fail guide for more details.ģ. It is a temporary delivery failure that occurs for a variety of reasons including because the mailbox is full, recipient email server is down or offline, email is too big, email is deferred, etc. But the email address can also be invalid due to typos, for example hotmal instead of hotmail.Ģ. Typically the domain name no longer exists or it no longer has registered mail servers. It is a permanent delivery failure that occurs because the recipient’s email address is invalid or no longer in use. The email marketing industry distinguishes the following bounce email types:ġ. There are lots of different reasons why emails bounce and when it happens, a “return to sender” message is sent by the recipient’s mail server that explains the reason of the bounce. So, when an email is returned to the sender without being accepted by the recipient’s mail server, the email is called bounce. If the recipient’s server has predetermined that it is not accepting emails from the sender for whatever reason, the server rejects the message and it will subsequently bounce back to the sender. If the emails are accepted by the recipient’s mail server, they are considered as sent. The recipient’s mail server tells the sender’s server whether or not it is ready to accept mail. Then it establishes a conversation with the recipient’s SMTP server by connecting through the port 25 to the recipient’s SMTP server. The SMTP server puts the email messages in the queue. If you are with an email service provider, your messages are given to their SMTP server.
EMAIL BOUNCE HANDLER 3.8.7 KEYGEN SOFTWARE
Whether you are sending emails through an email service provider or through your own SMTP server, your emails are always subject to the SMTP commands for acceptance or rejection of emails by the recipient’s mail server.Įvery email must successfully pass through multiple phases before it reaches the intended recipient.Īt first, the emails are sent from your email sending software to your SMTP server.
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