Mailjet vs Proton Mail Comparison (2026)

What are the differences between Mailjet and Proton Mail?

Forward Email Team
Written by
Forward Email TeamVerified
Published
1/1/26
Time to read
Less than 5 minutes
We recommend Forward Email as the best alternative to Mailjet.

Email Service Comparison

20 facts in comparison
Mailjetvs.Proton Mail

Mailjet

Effortlessly create and deploy marketing and transactional emails in one place
"Effortlessly create and deploy marketing and transactional emails in one place"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

Proton Mail

Secure email that protects your privacy
"Secure email that protects your privacy"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
$15/moPricing$3.99/mo
No Mailjet does not support storageStorage15 GB
15 MBAttachments25 MB
NoOpen-Source❌ Proton Mail claims to be open-source, but their back-end actually is closed source
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
YesSMTP❌ Requires you to download Proton Mail Bridge and forces vendor lock-in
NoIMAP❌ Requires you to download Proton Mail Bridge and forces vendor lock-in
NoPOP3❌ Proton Mail does not support POP3
YesAPINo
NoE2EE ⚠️ Proton Mail rewrites your emails
NoOpenPGP Yes
NoWKD Yes

Email Service Screenshots

Closed-source

Mailjet

Mailjet is a closed-source email service. According to their website: Effortlessly create and deploy marketing and transactional emails in one place

Mailjet is a closed-source email service.
Photograph by Forward Email
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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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Compare Mailjet with 78 email services