Customer.io vs Amazon Simple Email Service (SES) Comparison (2025)

What are the differences between Customer.io and Amazon Simple Email Service (SES)?

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 Customer.io.

Email Service Comparison

20 facts in comparison
Customer.iovs.Amazon Simple Email Service (SES)

Customer.io

Send messages people actually want to receive using real-time customer data
"Send messages people actually want to receive using real-time customer data"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

Amazon Simple Email Service (SES)

Get reliable, scalable email to communicate with customers at the lowest industry prices
"Get reliable, scalable email to communicate with customers at the lowest industry prices"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
$100/moPricing$X/mo; varies, using shared IP's from SES are known to have negative effect on deliverability
No Customer.io does not support storageStorageNo Amazon Simple Email Service (SES) does not support storage
2 MBAttachments10 MB
NoOpen-SourceNo
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
YesSMTPYes
NoIMAPNo
NoPOP3No
YesAPIYes
NoE2EE No
NoOpenPGP No
NoWKD No

Email Service Screenshots

Closed-source

Customer.io

Customer.io is a closed-source email service. According to their website: Send messages people actually want to receive using real-time customer data

Customer.io is a closed-source email service.
Photo by Forward Email
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Closed-source

Amazon Simple Email Service (SES)

Amazon Simple Email Service (SES) is a closed-source email service. Its description from its website is: Get reliable, scalable email to communicate with customers at the lowest industry prices

Amazon Simple Email Service (SES) is a closed-source email service.
Photo by Forward Email
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Compare Customer.io with 78 email services