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ProtonMail

Rich Email Signatures Meet End-to-End Encryption

ProtonMail prioritizes privacy and security, but that does not mean your signatures have to be plain text. Siggly helps you create professional HTML signatures that work within ProtonMail's web client and through Proton Bridge for desktop clients.

100M+
Proton accounts worldwide
E2EE
End-to-end encryption preserved
HTML
Rich signature support included

Siggly + ProtonMail

Encryption-Aware Signatures

Siggly signatures work within ProtonMail's encryption model. Images are hosted externally with privacy-conscious CDN settings.

ProtonMail HTML Editor Support

ProtonMail's web client supports HTML signatures natively. Paste Siggly-generated HTML directly into the signature settings panel.

Proton Bridge Integration

Using Proton Bridge with Outlook or Thunderbird? Siggly signatures work seamlessly through Bridge-connected desktop clients.

Privacy-First Image Hosting

Signature images are served from our CDN without tracking pixels that would conflict with ProtonMail's privacy-focused approach.

Adding a Signature to ProtonMail

1

Design in Siggly

Create your signature using the visual editor. Select a template optimized for ProtonMail's supported HTML subset.

2

Copy the HTML

Export the signature as HTML. Siggly strips unsupported elements to ensure compatibility with ProtonMail's composer.

3

Paste into ProtonMail Settings

Go to ProtonMail Settings, select the signature section, switch to the HTML editor, and paste your Siggly-generated signature.

Encryption and Email Signatures

When you send an encrypted email through ProtonMail, the signature is included in the encrypted message body. This means recipients using ProtonMail see the full rich signature after decryption, maintaining both security and professionalism.

For emails sent to non-ProtonMail recipients, the signature appears as standard HTML in the message. External image references in the signature load normally for these recipients, while ProtonMail users see a prompt to load remote content per their privacy preferences.

Siggly respects this model by avoiding tracking pixels and providing clean image URLs. If your organization requires maximum privacy, you can opt to embed images as base64 data URIs, though this increases message size.

"We moved to ProtonMail for privacy and thought we would have to give up professional signatures. Siggly proved us wrong — our signatures look great and respect our encryption-first philosophy."

Erik Lindqvist

Security Engineer, NordVault Crypto

Frequently Asked Questions

Does ProtonMail support HTML email signatures?
Yes. ProtonMail's web client has a built-in HTML signature editor. You can paste rich HTML generated by Siggly directly into the settings panel.
Will my signature be encrypted with the email?
When sending encrypted emails to other ProtonMail users, the signature is part of the encrypted message body. For unencrypted emails to external recipients, the signature is sent as standard HTML.
Can I use Siggly signatures through Proton Bridge?
Yes. Proton Bridge connects ProtonMail to desktop clients like Outlook and Thunderbird. Signatures configured in those clients through Siggly work normally via Bridge.
Are signature images blocked by ProtonMail privacy settings?
ProtonMail blocks remote images by default for incoming mail. Your own signature images display normally in your sent messages. Recipients on ProtonMail will see them after choosing to load remote content.
Does Siggly add tracking pixels to signatures?
No. Siggly analytics are opt-in and use link-level tracking, not hidden pixels. For ProtonMail users who prioritize privacy, you can disable all tracking features entirely.

Bring Professional Signatures to ProtonMail

Privacy and professionalism are not mutually exclusive. Design your ProtonMail signature with Siggly today.