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How do I send emails?

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My recipient can't open what I sent via Safari and Outlook. I want to try sending with Firefox but don;t see how to do it.

My recipient can't open what I sent via Safari and Outlook. I want to try sending with Firefox but don;t see how to do it.

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Thunderbird

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You posted your question in the Firefox for iOS forum, but I wonder if your question is really about Firefox on Mac. If you're using a web browser to send email, the formatting is dictated by the website you're using to send the email, not the browser.