Mailgun vs Fastmail Comparison (2025)

What are the differences between Mailgun and Fastmail?

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 Mailgun.

Email Service Comparison

20 facts in comparison
Mailgunvs.Fastmail

Mailgun

Flexible, scalable, and results driven email sending platform
"Flexible, scalable, and results driven email sending platform"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

Fastmail

Fast, private email that’s just for you
"Fast, private email that’s just for you"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
$35/moPricing$3/mo
No Mailgun does not support storageStorage2 GB
25 MBAttachments70 MB
NoOpen-SourceNo
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
YesSMTPYes
NoIMAPYes
NoPOP3Yes
YesAPINo
NoE2EE No
NoOpenPGP ⚠️ Fastmail does support PGP, but not in their webmail; see this blog post for insight
NoWKD No

Email Service Screenshots

Closed-source

Mailgun

Mailgun is a closed-source email service. Their website says: Flexible, scalable, and results driven email sending platform

Mailgun is a closed-source email service.
Screenshot by Forward Email
Go to site
Closed-source

Fastmail

Fastmail is a closed-source email service. Its description from its website is: Fast, private email that’s just for you

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

Compare Mailgun with 78 email services