Heimdal vs Cisco Secure Email Defense Comparison (2026)

What are the differences between Heimdal and Cisco Secure Email Defense?

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 Heimdal. We also support webmail: https://mail.forwardemail.net

Email Service Comparison

20 facts in comparison
Heimdalvs.Cisco Secure Email Defense

Heimdal

One Platform. Total Security.
"One Platform. Total Security."
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

Cisco Secure Email Defense

Advanced protection to safeguard your inboxes
"Advanced protection to safeguard your inboxes"
  • 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 partyStorageUnknown
UnknownAttachments100 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

Heimdal

Heimdal is a closed-source email service. Their official description reads: One Platform. Total Security.

Heimdal is a closed-source email service.
Photograph by Forward Email
Visit Website
Closed-source

Cisco Secure Email Defense

Cisco Secure Email Defense is a closed-source email service. According to their website: Advanced protection to safeguard your inboxes

Cisco Secure Email Defense is a closed-source email service.
Screenshot by Forward Email
Go to site

Compare Heimdal with 78 email services