Startmail vs Posteo Comparison (2026)

Compare Startmail vs Posteo 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 Startmail. We also support webmail: https://mail.forwardemail.net

Email Service Comparison

20 facts in comparison
Startmailvs.Posteo

Startmail

Private email you can trust
"Private email you can trust"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

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
$7/moPricing€1/mo
20 GBStorage2 GB
25 MBAttachments50 MB
NoOpen-SourceNo
❌ Startmail claims to use a User Vault, but this statement has not been audited and their source code is closed-sourceSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
YesSMTPYes
YesIMAPYes
YesPOP3Yes
NoAPINo
⚠️ Supported if both sender and recipient are using OpenPGPE2EE ⚠️ Opt-in
⚠️ Supports OpenPGP, but does not support WKDOpenPGP Yes
NoWKD Yes

Email Service Screenshots

Closed-source

Startmail

Startmail is a closed-source email service. Its description from its website is: Private email you can trust

Startmail is a closed-source email service.
Photograph by Forward Email
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Closed-source

Posteo

Posteo is a closed-source email service. According to their website: Green, secure, ad-free

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