Mailchimp vs Proton Mail Comparison (2025)

What are the differences between Mailchimp 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 Mailchimp.

Email Service Comparison

20 facts in comparison

Mailchimp	vs.	Proton Mail
Mailchimp "Turn Emails into Revenue" Website	vs.	Proton Mail "Secure email that protects your privacy" Website
$33/mo	Pricing	$3.99/mo
No Mailchimp does not support storage	Storage	15 GB
25 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 paid add-on for Mandrill of at least $20/mo	SMTP	❌ Requires you to download Proton Mail Bridge and forces vendor lock-in
No	IMAP	❌ Requires you to download Proton Mail Bridge and forces vendor lock-in
No	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

Mailchimp

Mailchimp is a closed-source email service. Their official description reads: Turn Emails into Revenue

Mailchimp is a closed-source email service.

Photograph 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.

Screenshot by Forward Email

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