Compose and send emails
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How to check encryption status using lock icons
All messages in Proton Mail show a lock icon that tells you their encryption status. In this article, we explain what these locks mean.
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Read receipts
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How to set up an automatic reply
Here's how to set up an Out of Office or Vacation automatic response to all or some of your emails in Proton Mail using our auto reply feature.
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How to use Undo Send
If you want to recall an email after you click Send in Proton Mail, you can use the Undo Send feature to retrieve your message.
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How to set the default font and font size in the composer window
In addition to formatting text in the composer window using the formatting ribbon, you can specify a default font and font size.
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How to use PGP with Proton Mail
Learn how to use PGP so you can encrypt your email communications when communicating with contacts who don't use Proton Mail.
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Proton Mail message expiration
Proton Mail allows you to set a time for encrypted messages to expire (automatically delete themselves). Learn how.
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How to schedule emails in Proton Mail (Schedule send)
Proton Mail lets you schedule emails to be sent at a later time. Just follow these steps.
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Attachment reminders
Proton Mail's attachment reminders prevent you from accidentally sending emails to your recipient without including the mentioned attachments.
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How to send an encrypted email
Learn more about email encryption and the easiest way to send a secure email using Proton Mail.
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Can non-Proton Mail users respond to encrypted messages?
If you're on Proton Mail, learn how non-Proton Mail users can receive password-protected messages from you and reply securely.
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Encrypting attachments
Read about how Proton Mail handles the attachments, and what happens when you send and receive attachments form Proton Mail and non-Proton Mail contacts
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Attachment and email size limits
You can attach multiple files to an email in Proton Mail by clicking the Attachment button or dragging and dropping a file into the email composer.
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Why are my files larger on Proton Mail than on my device?
Learn why your attachments on Proton Mail appear larger in your email than on your device.