Our Guarantee

The Emailable Guarantee

Email deliverability is a critical metric for the success of your email campaigns, and your mailing reputation as a whole. Emailable uses industry best practices to ensure the most accurate verification results possible. We back up our verification results with an up to 99%+ deliverability rate guarantee with below circumstances:

  • 97%+ Accuracy rates on Microsoft email accounts (Office 365, Hotmail, MSN, Outlook, Live, etc.).
  • 99%+ Accuracy rates on everything else.
  • Yahoo! and AOL email addresses under the deactivation process are not covered by this deliverability guarantee.

Service Commitment and Exclusions

To be considered eligible for the 99%+ deliverability guarantee, your mailing practices must match the following criteria:

  • The minimum list size must be 1,000 unique email addresses.
  • Email must be sent within a 24 hour period after cleaning.
  • Email addresses must be classified as valid. Bounces must be the result of an invalid (non-existing) email address. Unqualified bounces may include (but are not limited to) poor sender reputation, mail server misconfiguration/unavailability, etc.
  • Email addresses must have come from your own opt-in sourced (no purchased lists, etc.).

If you believe we have not complied with our guarantee, please contact us via support within 7 days of the discrepancy. Qualified paying customers can receive a 100% refund for qualifying emails that did not meet our guarantee.

5.x Bounce Codes (Permanent Failures)

Code
Description

5.0.0

Address does not exist

5.1.0

Other address status

5.1.1

Bad destination mailbox address

5.1.2

Bad destination system address

5.1.3

Bad destination mailbox address syntax

5.1.4

Destination mailbox address ambiguous

5.1.5

Destination mailbox address valid

5.1.6

Mailbox has moved

5.1.7

Bad sender’s mailbox address syntax

5.1.8

Bad sender’s system address

5.2.0

Other or undefined mailbox status

5.2.1

Mailbox disabled, not accepting messages

5.2.2

Mailbox full

5.2.3

Message length exceeds administrative limit.

5.2.4

Mailing list expansion problem

5.3.0

Other or undefined mail system status

5.3.1

Mail system full

5.3.2

System not accepting network messages

5.3.3

System not capable of selected features

5.3.4

Message too big for system

5.4.0

Other or undefined network or routing status

5.4.1

No answer from host - the address is invalid

5.4.2

Bad connection

5.4.3

Routing server failure

5.4.4

Unable to route

5.4.5

Network congestion

5.4.6

Routing loop detected

5.4.7

Delivery time expired

5.5.0

Other or undefined protocol status

5.5.1

Invalid command

5.5.2

Syntax error

5.5.3

Too many recipients

5.5.4

Invalid command arguments

5.5.5

Wrong protocol version

5.6.0

Other or undefined media error

5.6.1

Media not supported

5.6.2

Conversion required and prohibited

5.6.3

Conversion required but not supported

5.6.4

Conversion with loss performed

5.6.5

Conversion failed

5.7.0

Other or undefined security status

5.7.1

Delivery not authorized, message refused

5.7.2

Mailing list expansion prohibited

5.7.3

Security conversion required but not possible

5.7.4

Security features not supported

5.7.5

Cryptographic failure

5.7.6

Cryptographic algorithm not supported

5.7.7

Message integrity failure

4.x Bounce Codes (Temporary Failure)

Code
Description

421

service not available, closing transmission channel

450

Requested mail action not taken: mailbox unavailable (e.g., mailbox busy)

451

Requested action aborted: error in processing

452

Requested action not taken: insufficient system storage

See why thousands of the world's largest companies trust Emailable for email deliverability.

Get Started Free

250 free credits