Skiff vs ImprovMX Comparison (2025)

What are the differences between Skiff and ImprovMX?

Forward Email Team
Written by
Forward Email TeamVerified
Published
2/1/25
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.ImprovMX

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.

ImprovMX

Create free email aliases for your domain name
"Create free email aliases for your domain name"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
$3/moPricing$9/mo
15 GBStorageNo ImprovMX does not support storage
25 MBAttachments50 MB
❌ Skiff claims to be open-source, but their back-end is actually closed-sourceOpen-SourceNo
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI TTI
❌ Skiff does not support SMTP and forces vendor lock-inSMTPYes
❌ Skiff does not support IMAP and forces vendor lock-inIMAPNo
❌ Skiff does not support POP3 and forces vendor lock-inPOP3No
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. Their website says: 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.
Screenshot by Forward Email
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Closed-source

ImprovMX

ImprovMX is a closed-source email service. According to their website: Create free email aliases for your domain name

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