AT&T vs Proton Mail Comparison (2026)

What are the differences between AT&T and Proton Mail?

Forward Email Team
Written by
Forward Email TeamVerified
Published
2/1/26
Time to read
Less than 5 minutes
We recommend Forward Email as the best alternative to AT&T. We also support webmail: https://mail.forwardemail.net

Email Service Comparison

20 facts in comparison
AT&Tvs.Proton Mail

AT&T

AT&T Mail is now Yahoo Mail
"AT&T Mail is now Yahoo Mail"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

Proton Mail

Secure email that protects your privacy
"Secure email that protects your privacy"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
$5/moPricing$3.99/mo
5000 GBStorage15 GB
25 MBAttachments25 MB
NoOpen-Source❌ Proton Mail claims to be open-source, but their back-end actually is closed source
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
❌ No longer supportedSMTP❌ Requires you to download Proton Mail Bridge and forces vendor lock-in
❌ No longer supportedIMAP❌ Requires you to download Proton Mail Bridge and forces vendor lock-in
❌ No longer supportedPOP3❌ Proton Mail does not support POP3
NoAPINo
NoE2EE ⚠️ Proton Mail rewrites your emails
NoOpenPGP Yes
NoWKD Yes

Email Service Screenshots

Closed-source

AT&T

AT&T is a closed-source email service. Its description from its website is: AT&T Mail is now Yahoo Mail

AT&T is a closed-source email service.
Photo by Forward Email
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Closed-source

Proton Mail

Proton Mail is a closed-source email service. Its description from its website is: Secure email that protects your privacy

Proton Mail is a closed-source email service.
Photograph by Forward Email
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Compare AT&T with 78 email services