Overview
This article provides answers to common questions regarding blocked email.
FAQs
What is blocked email?
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A blocked email is a message that was sent to someone, but then the recipient's mail server rejected it, causing the email to bounce back to your address.
Why is email blocked?
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A common reason is that the receiving mail server viewed your incoming mail as spam and blocked it. See this article for further details. If you have any further questions about why a message was blocked, please contact support.
What is an example of a blocked email?
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The bounce message sometimes explains why your email is being blocked, but other times the message can be very vague. It depends on the company bouncing the email back to you. Here are a few examples of the text you may see:
- 550-Requested action not taken: mailbox unavailable 550-Reject due to policy restrictions.
- delivery temporarily suspended: host refused to talk to me:
What is 'Greylisting'?
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Sometimes mail isn't blocked, but is greylisted instead. In this case, you must wait until the mail host allows emails to be received again. Here's an example of a bounce you may see:
- Message temporarily deferred The user you are trying to contact is receiving mail at a rate that 450-4.2.1 prevents additional messages from being delivered. Please resend your 450-4.2.1 message at a later time.
What can I do about blocked email?
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You should contact support if you believe your email is being blocked. Make sure to provide support with the following in order to troubleshoot your issue:
- The full text of the bounced email
- The full headers of the original email (which should be quoted in the bounce). NOTE: These are not the headers of the bounced email.