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Home /Knowledge Base /Getting started with ProtonMail/Send & receive messages

Send & receive messages

Why are my files larger on ProtonMail than on my device?

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ProtonMail Secure Messages

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How to use Undo Send

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What is a “Sending Limit”?

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Composing emails in Normal mode or Plain text mode

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Attachment and email size limits

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How to send messages

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Message Expiration

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Encrypting attachments

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How to use PGP

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