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What is Greylisting?

Greylisting is a system used to reduce the amount of unwanted Spam emails that you may receive.

When an email is received to your inbox from an unknown contact, the email is rejected with a “try again later” message. If the email is a legitimate email, the sending server will then try again, and the email will then be accepted and delivered to your inbox.

If the email is spam, it typically will not be sent again as this will take up resources for the source of the spam.

There may be a short delay in receiving emails due to Greylisting. This delay is usually about 15 minutes, but can be longer depending on the sending server settings. However, this also means that any Spam that is sent again may have been picked up by anti-spam software and blacklists, so will no longer be accepted.

To ensure that emails that you want to receive are delivered to promptly to your Inbox, you can add all known and trusted email addresses and domains to your Whitelist. You can find a help guide for adding addresses to your Whitelist here.


If you have any questions about Greylisting, please contact our helpdesk at