Email delayed and not delivered
Category: Email Troubleshooting
Hello. One of my domains, added through WHM can't receive email (reason: delayed) and after a few retries they get unqueued. Any possible solutions for this? Maybe a permissions issue, as mentioned in other topics related to this problem? Thank you.
Thank you for your question about delayed emails. Typically, "delayed" or "deferred" messages are due to greylisting. "Greylisting is a methodology utilized by some mail servers to deter spam. If you send a message to a server that uses greylisting and you are not on that server's whitelist the receiving server will "temporarily reject" that message and will often return a message that is formatted very similar to a bounce back but will list the error as temporary instead of permanent. The sending server will attempt to resend the message at a later time, but the recipient will experience a delay in receiving the message. The best way to avoid greylisting is to ask anyone who uses greylisting on their server to add you to their whitelist so they can receive messages from you without delay."
When an email fails it will usually provide a Returned/Bounced message or notification, which will include detailed information, such as the cause, or time of failure.
If not, you can view the full summary of mail activity from the Exim mail log for more detailed information.
If you have any further questions, feel free to post them below.
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