addy.io vs Cisco Secure Email Defense Comparison (2026)

What are the differences between addy.io 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 addy.io. We also support webmail: https://mail.forwardemail.net

Email Service Comparison

20 facts in comparison
addy.iovs.Cisco Secure Email Defense

addy.io

Protect your real email address using email aliases
"Protect your real email address using email aliases"
  • 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
$4/moPricingRequires you to talk to a sales team
No addy.io does not support storageStorageUnknown
25 MBAttachments100 MB
YesOpen-SourceNo
NoSandboxed Encryption No
NoUnlimited DomainsNo
YesUnlimited AliasesNo
NoTTI No
NoSMTP❌ Requires 3rd party
NoIMAP❌ Requires 3rd party
NoPOP3❌ Requires 3rd party
NoAPIYes
NoE2EE No
NoOpenPGP No
NoWKD No

Email Service Screenshots

Open-source

addy.io

addy.io is an open-source email service. Their official description reads: Protect your real email address using email aliases

addy.io is an open-source email service.
Screenshot by Forward Email
Go to site
Closed-source

Cisco Secure Email Defense

Cisco Secure Email Defense is a closed-source email service. Their official description reads: Advanced protection to safeguard your inboxes

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

Compare addy.io with 78 email services