6 Best Open-Source Email Services in 2024
Reviews, comparison, screenshots and more for the 6 best open-source email services.
Open-Source Email Service Comparison
| Email Service | Pricing | Storage | Attachments | Open-Source | Sandboxed Encryption | Unlimited Domains | Unlimited Aliases | TTI | SMTP | IMAP | POP3 | API | E2EE | OpenPGP | WKD |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Forward Email⭐ SuggestedEmail service for everyone | $3/mo | 10 GB pooled | 50 MB | Yes | Yes | Yes | Yes | TTI | Yes | Yes | Yes | Yes | ⚠️ Opt-in | Yes | Yes |
SkiffPrivacy-first end-to-end encrypted email (NOTE: this company is no longer in business and shutting down service in August 2024) | $3/mo | 15 GB | 25 MB | ❌ Skiff claims to be open-source, but their back-end is actually closed-source | No | No | No | No | ❌ Skiff does not support SMTP and forces vendor lock-in | ❌ Skiff does not support IMAP and forces vendor lock-in | ❌ Skiff does not support POP3 and forces vendor lock-in | No | ⚠️ Supported, but Skiff manages your private keys and is closed-source | Yes | Yes |
Proton MailSecure email that protects your privacy | $3.99/mo | 15 GB | 25 MB | ❌ Proton Mail claims to be open-source, but their back-end actually is closed source | No | No | No | No | ❌ Requires you to download Proton Mail Bridge and forces vendor lock-in | ❌ Requires you to download Proton Mail Bridge and forces vendor lock-in | ❌ Proton Mail does not support POP3 | No | ⚠️ Proton Mail rewrites your emails | Yes | Yes |
SimpleLoginReceive and send emails anonymously | $4/mo | No SimpleLogin does not support storage | 25 MB | Yes | No | Yes | Yes | No | No | No | No | No | ⚠️ Opt-in | Yes | No |
addy.ioProtect your real email address using email aliases | $4/mo | No addy.io does not support storage | 25 MB | Yes | No | No | Yes | No | No | No | No | No | No | No | No |
TutanotaSecure, green and ad-free. Email to feel good about | €36/yr | 20 GB | 25 MB | ❌ Tutanota claims to be open-source, but their back-end is actually closed-source | No | No | No | No | No | No | No | No | No | ⚠️ Tutanota does not support PGP | No |
Open-Source Email Service Screenshots
Forward Email
Forward Email is an open-source email service. Their website says: Email service for everyone
Skiff
Skiff is a closed-source email service. Its descriptoin 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)
Proton Mail
Proton Mail is a closed-source email service. Their website says: Secure email that protects your privacy
SimpleLogin
SimpleLogin is an open-source email service. Their official description reads: Receive and send emails anonymously
addy.io
addy.io is an open-source email service. Their website says: Protect your real email address using email aliases
Tutanota
Tutanota is a closed-source email service. Their website says: Secure, green and ad-free. Email to feel good about
