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How do I send a message to all my contacts and is there a limit on numbers?

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I have selected all my address contacts to send them a message but firefox will not send the message (a change of email address).

I have selected all my address contacts to send them a message but firefox will not send the message (a change of email address).

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You will have to contact your e-mail provider for help.

Or are you talking about Thunderbird?

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Firefox doesn't do email, it's strictly a web browser.

If you are using Firefox to access your mail, you are using "web-mail". You need to seek support from your service provider or a forum for that service.

If your problem is with Thunderbird, let us know and we can move this thread to the Thunderbird queue. This question currently is in the Firefox queue for answers.