Proton Mail vs 123 Reg Comparison (2025)

What are the differences between Proton Mail and 123 Reg?

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 Proton Mail.

Email Service Comparison

20 facts in comparison

Proton Mail	vs.	123 Reg
Proton Mail "Secure email that protects your privacy" Website	vs.	123 Reg "Professional email that shows you mean business" Website
$3.99/mo	Pricing	£35.88/yr
15 GB	Storage	10 GB
25 MB	Attachments	30 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	Yes
❌ Requires you to download Proton Mail Bridge and forces vendor lock-in	IMAP	Yes
❌ Proton Mail does not support POP3	POP3	Yes
No	API	No
⚠️ Proton Mail rewrites your emails	E2EE	No
Yes	OpenPGP	No
Yes	WKD	No