Mailinblack vs DuoCircle Comparison (2025)

What are the differences between Mailinblack and DuoCircle?

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 Mailinblack.

Email Service Comparison

20 facts in comparison
Mailinblackvs.DuoCircle

Mailinblack

Your cybersecurity is our job
"Your cybersecurity is our job"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

DuoCircle

Protect Email Against Phishing, Spam and Malware
"Protect Email Against Phishing, Spam and Malware"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
Requires you to talk to a sales teamPricingRequires you to talk to a sales team
Requires 3rd partyStorageRequires 3rd party
UnknownAttachments50 MB
NoOpen-SourceNo
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
❌ Requires 3rd partySMTP❌ Requires 3rd party
❌ Requires 3rd partyIMAP❌ Requires 3rd party
❌ Requires 3rd partyPOP3❌ Requires 3rd party
YesAPIYes
NoE2EE No
NoOpenPGP No
NoWKD No

Email Service Screenshots

Closed-source

Mailinblack

Mailinblack is a closed-source email service. According to their website: Your cybersecurity is our job

Mailinblack is a closed-source email service.
Screenshot by Forward Email
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Closed-source

DuoCircle

DuoCircle is a closed-source email service. According to their website: Protect Email Against Phishing, Spam and Malware

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