N‑able Mail Assure vs Klaviyo Comparison (2026)

What are the differences between N‑able Mail Assure and Klaviyo?

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 N‑able Mail Assure. We also support webmail: https://mail.forwardemail.net

Email Service Comparison

20 facts in comparison
N‑able Mail Assurevs.Klaviyo

N‑able Mail Assure

Email protection to help you secure and scale
"Email protection to help you secure and scale"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

Klaviyo

Power smarter digital relationships
"Power smarter digital relationships"
  • 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 teamPricing$20/mo
Requires 3rd partyStorageNo Klaviyo does not support storage
Depends on inbound/outbound (e.g. 10 MB)Attachments0 MB
NoOpen-SourceNo
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
❌ Requires 3rd partySMTPNo
❌ Requires 3rd partyIMAPNo
❌ Requires 3rd partyPOP3No
YesAPINo
NoE2EE No
NoOpenPGP No
NoWKD No

Email Service Screenshots

Closed-source

N‑able Mail Assure

N‑able Mail Assure is a closed-source email service. Their official description reads: Email protection to help you secure and scale

N‑able Mail Assure is a closed-source email service.
Photograph by Forward Email
Go to site
Closed-source

Klaviyo

Klaviyo is a closed-source email service. Their website says: Power smarter digital relationships

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

Compare N‑able Mail Assure with 78 email services