Heimdal vs Sendgrid Comparison (2025)

What are the differences between Heimdal and Sendgrid?

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 Heimdal.

Email Service Comparison

20 facts in comparison
Heimdalvs.Sendgrid

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.

Sendgrid

Get your emails to the inbox—where they belong
"Get your emails to the inbox—where they belong"
  • 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$19.95/mo
Requires 3rd partyStorageNo Sendgrid does not support storage
UnknownAttachments30 MB
NoOpen-SourceNo
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
❌ Requires 3rd partySMTPYes
❌ Requires 3rd partyIMAPNo
❌ Requires 3rd partyPOP3No
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.
Photo by Forward Email
Go to site
Closed-source

Sendgrid

Sendgrid is a closed-source email service. Their official description reads: Get your emails to the inbox—where they belong

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

Compare Heimdal with 78 email services