Posteo vs Heimdal Comparison (2026)

Compare Posteo vs Heimdal email services. In-depth analysis of features, pricing, security, privacy, and storage to find the best email provider for your needs.

Forward Email Team
Written by
Forward Email TeamVerified
Published
4/1/26
Time to read
Less than 5 minutes
We recommend Forward Email as the best alternative to Posteo. We also support webmail: https://mail.forwardemail.net

Email Service Comparison

20 facts in comparison
Posteovs.Heimdal

Posteo

Green, secure, ad-free
"Green, secure, ad-free"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

Heimdal

One Platform. Total Security.
"One Platform. Total Security."
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
€1/moPricingRequires you to talk to a sales team
2 GBStorageRequires 3rd party
50 MBAttachmentsUnknown
NoOpen-SourceNo
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
YesSMTP❌ Requires 3rd party
YesIMAP❌ Requires 3rd party
YesPOP3❌ Requires 3rd party
NoAPIYes
⚠️ Opt-inE2EE No
YesOpenPGP No
YesWKD No

Email Service Screenshots

Closed-source

Posteo

Posteo is a closed-source email service. Their official description reads: Green, secure, ad-free

Posteo is a closed-source email service.
Photo by Forward Email
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Closed-source

Heimdal

Heimdal is a closed-source email service. Their official description reads: One Platform. Total Security.

Heimdal is a closed-source email service.
Screenshot by Forward Email
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Compare Posteo with 78 email services