Compose and send emails

    1. Proton Mail
    2. Using Proton Mail
    3. Compose and send emails

    Attachment reminders

    Proton Mail's attachment reminders prevent you from accidentally sending emails to your recipient without including the mentioned attachments.

    1. Proton Mail
    2. Using Proton Mail
    3. Compose and send emails

    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.

    1. Proton Mail
    2. Using Proton Mail
    3. Compose and send emails

    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.

    1. Proton Mail
    2. Using Proton Mail
    3. Compose and send emails

    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.

    1. Proton Mail
    2. Using Proton Mail
    3. Compose and send emails

    Read receipts

    1. Proton Mail
    2. Using Proton Mail
    3. Compose and send emails

    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.

    1. Proton Mail
    2. Using Proton Mail
    3. Compose and send emails

    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.

    1. Proton Mail
    2. Using Proton Mail
    3. Compose and send emails

    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.

    1. Proton Mail
    2. Using Proton Mail
    3. Compose and send emails

    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.

    1. Proton Mail
    2. Using Proton Mail
    3. Compose and send emails

    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

    1. Proton Mail
    2. Using Proton Mail
    3. Compose and send emails

    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.

    1. Proton Mail
    2. Using Proton Mail
    3. Compose and send emails

    Proton Mail message expiration

    With Proton Mail, you can set encrypted messages to expire after a set amount of time for Proton Mail and non-Proton Mail recipients.

    1. Proton Mail
    2. Using Proton Mail
    3. Compose and send emails

    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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