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When I try to send a message to a group or reply all to a group I get this error: An error occurred while sending mail. The mail server responded: 5.2.0 3uaJ1x

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Trying to send or "reply all" to a group message generates this error message. "An error occurred while sending mail. The mail server responded: 5.2.0 3uaJ1x0020rJ4F001uaJvR internal error. Please check the message and try again."

I can send individual emails and reply to individual emails without a problem. Only get error when sending group message or "replying all" to a group message.

Trying to send or "reply all" to a group message generates this error message. "An error occurred while sending mail. The mail server responded: 5.2.0 3uaJ1x0020rJ4F001uaJvR internal error. Please check the message and try again." I can send individual emails and reply to individual emails without a problem. Only get error when sending group message or "replying all" to a group message.

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Rats. 5.2.0 is about the most vague and unhelpful error code you could imagine. Typically, it's explained as "Other or undefined mailbox status".

How big is your "group"? What mix of To:, Cc: and Bcc: is being used? Are they separate discrete addresses or is a Mailing List being used? (I guess this isn't a Mailing List, since "reply all" wouldn't apply).

Have you reported this to your email provider? The error message is, after all, issued by their server.