Proofpoint vs Proton Mail Comparison (2025)

What are the differences between Proofpoint and Proton Mail?

Written by

Forward Email Team

Published

7/1/25

Time to read

Less than 5 minutes

We recommend Forward Email as the best alternative to Proofpoint.

Email Service Comparison

20 facts in comparison

Proofpoint	vs.	Proton Mail
Proofpoint "The leader in human-centric cybersecurity" Website	vs.	Proton Mail "Secure email that protects your privacy" Website
See Proofpoint plans (requires you to talk to a sales team) (according to a Reddit thread it may cost upwards of +$1000-2000 per month)	Pricing	$3.99/mo
Unknown	Storage	15 GB
150 MB	Attachments	25 MB
No	Open-Source	❌ Proton Mail claims to be open-source, but their back-end actually is closed source
No	Sandboxed Encryption	No
No	Unlimited Domains	No
No	Unlimited Aliases	No
No	TTI	No
❌ Requires 3rd party	SMTP	❌ Requires you to download Proton Mail Bridge and forces vendor lock-in
❌ Requires 3rd party	IMAP	❌ Requires you to download Proton Mail Bridge and forces vendor lock-in
❌ Requires 3rd party	POP3	❌ Proton Mail does not support POP3
Yes	API	No
No	E2EE	⚠️ Proton Mail rewrites your emails
No	OpenPGP	Yes
No	WKD	Yes

Email Service Screenshots

Closed-source

Proofpoint

Proofpoint is a closed-source email service. Their official description reads: The leader in human-centric cybersecurity

Proofpoint is a closed-source email service.

Photo by Forward Email

Closed-source

Proton Mail

Proton Mail is a closed-source email service. Its description from its website is: Secure email that protects your privacy

Proton Mail is a closed-source email service.

Photograph by Forward Email

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