Proton Mail vs N‑able Mail Assure Comparison (2026)

What are the differences between Proton Mail and N‑able Mail Assure?

Written by

Forward Email Team

Published

2/1/26

Time to read

Less than 5 minutes

We recommend Forward Email as the best alternative to Proton Mail. We also support webmail: https://mail.forwardemail.net

Email Service Comparison

20 facts in comparison

Proton Mail	vs.	N‑able Mail Assure
Proton Mail "Secure email that protects your privacy" Website	vs.	N‑able Mail Assure "Email protection to help you secure and scale" Website
$3.99/mo	Pricing	Requires you to talk to a sales team
15 GB	Storage	Requires 3rd party
25 MB	Attachments	Depends on inbound/outbound (e.g. 10 MB)
❌ Proton Mail claims to be open-source, but their back-end actually is closed source	Open-Source	No
No	Sandboxed Encryption	No
No	Unlimited Domains	No
No	Unlimited Aliases	No
No	TTI	No
❌ Requires you to download Proton Mail Bridge and forces vendor lock-in	SMTP	❌ Requires 3rd party
❌ Requires you to download Proton Mail Bridge and forces vendor lock-in	IMAP	❌ Requires 3rd party
❌ Proton Mail does not support POP3	POP3	❌ Requires 3rd party
No	API	Yes
⚠️ Proton Mail rewrites your emails	E2EE	No
Yes	OpenPGP	No
Yes	WKD	No