123 Reg vs Proton Mail Comparison (2025)

What are the differences between 123 Reg 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 123 Reg.

Email Service Comparison

20 facts in comparison

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

Email Service Screenshots

Closed-source

123 Reg

123 Reg is a closed-source email service. According to their website: Professional email that shows you mean business

123 Reg is a closed-source email service.

Photograph by Forward Email

Closed-source

Proton Mail

Proton Mail is a closed-source email service. Their website says: Secure email that protects your privacy

Proton Mail is a closed-source email service.

Photograph by Forward Email

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