Proton Mail vs OOPSpam Comparison (2025)

What are the differences between Proton Mail and OOPSpam?

Forward Email Team
Written by
Forward Email TeamVerified
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 Mailvs.OOPSpam

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
vs.

OOPSpam

Automate your Spam and Abuse Detection
"Automate your Spam and Abuse Detection"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
$3.99/moPricing$49/mo
15 GBStorageRequires 3rd party
25 MBAttachmentsUnknown
❌ Proton Mail claims to be open-source, but their back-end actually is closed sourceOpen-SourceNo
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
❌ Requires you to download Proton Mail Bridge and forces vendor lock-inSMTP❌ Requires 3rd party
❌ Requires you to download Proton Mail Bridge and forces vendor lock-inIMAP❌ Requires 3rd party
❌ Proton Mail does not support POP3POP3❌ Requires 3rd party
NoAPIYes
⚠️ Proton Mail rewrites your emailsE2EE No
YesOpenPGP No
YesWKD No

Email Service Screenshots

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
Go to site
Closed-source

OOPSpam

OOPSpam is a closed-source email service. Their website says: Automate your Spam and Abuse Detection

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