Spam Hero vs Proton Mail Comparison (2025)

What are the differences between Spam Hero 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 Spam Hero.

Email Service Comparison

20 facts in comparison

Spam Hero	vs.	Proton Mail
Spam Hero "Cloud-Based Spam Filtering" Website	vs.	Proton Mail "Secure email that protects your privacy" Website
$8/mo	Pricing	$3.99/mo
Requires 3rd party	Storage	15 GB
50 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

Spam Hero

Spam Hero is a closed-source email service. Their official description reads: Cloud-Based Spam Filtering

Spam Hero is a closed-source email service.

Screenshot by Forward Email

Closed-source

Proton Mail

Proton Mail is a closed-source email service. According to their website: Secure email that protects your privacy

Proton Mail is a closed-source email service.

Photograph by Forward Email

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