Apple Mail (iCloud) vs Customer.io Comparison (2026)

What are the differences between Apple Mail (iCloud) and Customer.io?

Forward Email Team
Written by
Forward Email TeamVerified
Published
3/1/26
Time to read
Less than 5 minutes
We recommend Forward Email as the best alternative to Apple Mail (iCloud). We also support webmail: https://mail.forwardemail.net

Email Service Comparison

20 facts in comparison
Apple Mail (iCloud)vs.Customer.io

Apple Mail (iCloud)

Private, secure, and personal email from Apple
"Private, secure, and personal email from Apple"
  • Hardenize Test
  • Internet.nl Site Test
  • Internet.nl Mail Test
  • Mozilla HTTP Observatory Grade
  • Qualys SSL Labs SSL Server Test
vs.

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
$0.99Pricing$100/mo
50 GB pooledStorageNo Customer.io does not support storage
20 MBAttachments2 MB
NoOpen-SourceNo
NoSandboxed Encryption No
NoUnlimited DomainsNo
NoUnlimited AliasesNo
NoTTI No
YesSMTPYes
YesIMAPNo
❌ iCloud does not support POP3POP3No
NoAPIYes
NoE2EE No
NoOpenPGP No
NoWKD No

Email Service Screenshots

Closed-source

Apple Mail (iCloud)

Apple Mail (iCloud) is a closed-source email service. According to their website: Private, secure, and personal email from Apple

Apple Mail (iCloud) is a closed-source email service.
Photograph by Forward Email
Visit Website
Closed-source

Customer.io

Customer.io is a closed-source email service. Their official description reads: Send messages people actually want to receive using real-time customer data

Customer.io is a closed-source email service.
Screenshot by Forward Email
Visit Website

Compare Apple Mail (iCloud) with 78 email services