Verifiable Provider
business
Rackspace Email Email Verification
Rackspace Email is a long-running hosted business email service used by companies on custom domains.
How Rackspace Email Handles Verification
Rackspace-hosted mail (on emailsrvr.com MX) generally rejects unknown recipients with a 550, so mailbox existence is verifiable unless the domain has a catch-all. Rate limiting applies to aggressive senders.
What Mailthentic does
We identify the Rackspace MX cluster, throttle by it, interpret the RCPT TO response, and run a catch-all probe so results are accurate and respectful of their limits.
Quick Facts
MX Pattern
mx1.emailsrvr.com / mx2.emailsrvr.com
Catch-All Behavior
Rejects unknown addresses
Typical SMTP Response
550 for unknown recipients on most domains (verifiable)
Provider Type
business
Common Domains
varies (custom domains hosted on Rackspace)
Best Practices for Rackspace Email
- SMTP results are usually reliable. A 550 typically means the address does not exist.
- Verify at a steady pace. Rackspace throttles aggressive probing.
- Check for catch-all. Some hosted domains accept every address.
Other Email Providers
Verify Rackspace Email email addresses
Our 9-point verification engine handles Rackspace Email's specific behavior automatically. Start free.