Proofpoint vs Postmark Comparison (2025)

What are the differences between Proofpoint and Postmark?

Forward Email Team
Written by
Forward Email TeamVerified
Published
7/1/25
Time to read
Less than 5 minutes
We recommend Forward Email as the best alternative to Proofpoint.

Email Service Comparison

20 facts in comparison
Proofpointvs.Postmark

Proofpoint

The leader in human-centric cybersecurity
"The leader in human-centric cybersecurity"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

Postmark

The email delivery service that people actually like
"The email delivery service that people actually like"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
See Proofpoint plans (requires you to talk to a sales team) (according to a Reddit thread it may cost upwards of +$1000-2000 per month)Pricing$15/mo
UnknownStorageNo Postmark does not support storage
150 MBAttachments10 MB
NoOpen-SourceNo
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI TTI
❌ Requires 3rd partySMTPYes
❌ Requires 3rd partyIMAPNo
❌ Requires 3rd partyPOP3No
YesAPIYes
NoE2EE No
NoOpenPGP No
NoWKD No

Email Service Screenshots

Closed-source

Proofpoint

Proofpoint is a closed-source email service. Their website says: The leader in human-centric cybersecurity

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

Postmark

Postmark is a closed-source email service. According to their website: The email delivery service that people actually like

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