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Removing Users from MailList Based on Bounce Message

What is the best way to find out which email users can be removed from your opt-out message? For example, bounce error code 5.1.1, where the mailbox no longer exists.
I am using the mbox file format from Thunderbird.

My ideas include searching for status: 5.1.1, then searching ~ 2 lines down to see X-Display-Name: example@online.de. Does anyone know how to do this?

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One way to handle failures is how the ezmlm rollback handler does it. It sends a series of error messages to an address that bounces to check if the bounce was temporary or permanent. They describe their technique in detail on their Bounces and Automated Bounce Handling pages .

Jason Rowe has an excellent blog post Submitting Email Messages and Bounce Rules.

Also check out these failover guidelines .

Or you can manually encode which messages you want to bounce based on the bounce code. You can get a list of all the codes in RFC 3463 , which explains what each of them means and what type of failure they are.

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