Skiff vs Altospam Comparison (2025)

What are the differences between Skiff and Altospam?

Forward Email Team
Written by
Forward Email TeamVerified
Published
1/1/25
Time to read
Less than 5 minutes
We recommend Forward Email as the best alternative to Skiff.

Email Service Comparison

20 facts in comparison
Skiffvs.Altospam

Skiff

Privacy-first end-to-end encrypted email (NOTE: this company is no longer in business and shutting down service in August 2024)
"Privacy-first end-to-end encrypted email (NOTE: this company is no longer in business and shutting down service in August 2024)"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

Altospam

Antispam, Antivirus & Anti-Phishing Software
"Antispam, Antivirus & Anti-Phishing Software"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
$3/moPricingRequires you to talk to a sales team
15 GBStorageRequires 3rd party
25 MBAttachmentsUnknown
❌ Skiff claims to be open-source, but their back-end is actually closed-sourceOpen-SourceNo
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
❌ Skiff does not support SMTP and forces vendor lock-inSMTP❌ Requires 3rd party
❌ Skiff does not support IMAP and forces vendor lock-inIMAP❌ Requires 3rd party
❌ Skiff does not support POP3 and forces vendor lock-inPOP3❌ Requires 3rd party
NoAPIYes
⚠️ Supported, but Skiff manages your private keys and is closed-sourceE2EE No
YesOpenPGP No
YesWKD No

Email Service Screenshots

Closed-source

Skiff

Skiff is a closed-source email service. Its description from its website is: Privacy-first end-to-end encrypted email (NOTE: this company is no longer in business and shutting down service in August 2024)

Skiff is a closed-source email service.
Photograph by Forward Email
Go to site
Closed-source

Altospam

Altospam is a closed-source email service. Their official description reads: Antispam, Antivirus & Anti-Phishing Software

Altospam is a closed-source email service.
Photograph by Forward Email
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Compare Skiff with 79 email services