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mail delivery failed messages

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I get mail failed delivery messages when the email went through. Some times email doesn't go through and all emails are correct. I

I get mail failed delivery messages when the email went through. Some times email doesn't go through and all emails are correct. I

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Hi, The failed delivery messages are sent out from a mail server of a recipient. Thunderbird just displays them. In most of the cases the reason is displayed into the returned error.

Have a great day!