OOPSpam vs Postmark Comparison (2025)

What are the differences between OOPSpam 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 OOPSpam.

Email Service Comparison

20 facts in comparison
OOPSpamvs.Postmark

OOPSpam

Automate your Spam and Abuse Detection
"Automate your Spam and Abuse Detection"
  • 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
$49/moPricing$15/mo
Requires 3rd partyStorageNo Postmark does not support storage
UnknownAttachments10 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

OOPSpam

OOPSpam is a closed-source email service. Their website says: Automate your Spam and Abuse Detection

OOPSpam is a closed-source email service.
Photograph by Forward Email
Go to site
Closed-source

Postmark

Postmark is a closed-source email service. Their official description reads: The email delivery service that people actually like

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