Dealing with many “Mail Delivery Failed” addresses

When spammers sign up for your website, you get a lot of junk email addresses.  If you then institute a newsletter module, you may get several hundred “mail delivery failed” messages.  

In Apple mail, you can select all the individual messages and click “forward” to compile them into a single email.  (If you use conversations, first do View->Expand All Conversations in order to select individual messages.)  Then copy that, paste into, and you’ll get a list of the email addresses that bounced, which you can then bulk unsubscribe.  This works for me with the Drupal Simplenews module.

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