Bounce Back
When an email is unable to be delivered to the recipient, a bounce back email
will be received by the sender. This bounce back email usually contains a brief explanation
about the failure and a copy of the original email.
There are 6 types of bounce back emails in our system: (
Definition of Hard/Soft Bounce)
This is the most common type of bounce back. Sender receives it when a recipient is not found.
Exceptional Case:
Owing to the abuse of spam mails recently, recipients tend to use fake
"non-existent address" bounce back to fool spammers.
How to handle?
Our system will not delete your contacts even it is bounce back. You can observe
those email addresses one to two times before you remove them.
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Different from "non-existent address", "undeliverable" means the server
specified in the email doesn't exist. For example,
abc@yahoo.google.com, is an undeliverable address
because we can't find a server called "yahoo.google.com".
Exceptional Case:
The recipient's server may be temporary unavailable or under maintenance. If you
send emails during this period, you will receive an "undeliverable" bounce back email.
How to handle?
Our system will not delete your contacts even it is un-reachable. It is less
serious that "non-existent address", you can observe those contacts one to two
times before you remove them.
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This is the second common type of bounce back. It is sent when the recipient's
mailbox is full.
How to handle?
It is not a big problem. You may leave it and resend later on.
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This bounce back happens when your recipient is not in office and auto-reply is set
for incoming emails.
How to handle?
It is not a problem. You may leave it because the recipient will receive the email
once the mailbox is capable of accepting emails.
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When an email contains prohibited or spam-like content, this bounce back will
be sent. The target of blocking can be certain images, links, brand names or even a
particular phrase. The rule of blocking is to not open to public and it keeps changing.
It is not easy to tell which word causes blocking or which one avoids. By the
way, when you find a lot of "blocked" emails, you should revise the content
of your email.
How to handle?
Other than revising the content of your emails. You may try to contact your
recipients and ask them to click a "
Not Spam"
button to keep your emails away from spam-filters. It is the most effective way to avoid
blocking.
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When we are unable to recognize the bounce back email or the bounce back
email can't be classified into those standard bounce types, they will appear in this category.
How to handle?
Most of the time, they are temporary issues and you don't need to worry.
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