Result Codes

Last updated:
Text Code Numeric Code Description Safe to send?
Valid 0 Verified as real address Yes
Invalid 1 Verified as not valid No
Disposable 2 A temporary, disposable address No
Catchall 3 A domain-wide setting (learn more) Maybe
Not recommended unless on private server
Unknown 4 The server cannot be reached No

 

Valid

A valid email address has been verified as a real email that is currently accepting mail.

SAFE – These emails exist and have been verified for safe sending.

Invalid

An invalid email address has been verified as a bad recipient address that does not exist or is not accepting mail. Invalid emails will result in a bounce.

DON’T SEND – These emails do not exist and are not safe for sending.

Disposable

Disposable emails are temporary accounts used to avoid using a real personal account during a sign-up process. Common providers of disposable emails include Mailinator, Guerilla Mail, AirMail, and 10 Minute Mail.

DON’T SEND – These emails are fake or temporary emails and are not safe for sending.

Catch-All

This is also known as an “accept all”. This is a domain-wide setting where all emails on this domain will be reported as a catch-all. There is no definitive way to determine whether this email is valid or invalid.

A catch-all address is commonly used in small businesses to ensure a company receives any email that has been sent to them, regardless of typos. Additionally, these are also found in larger government, medical and educational organizations. Oftentimes these are infact valid emails. However some organizations may utilize this setting as a security feature to prevent unsolicited emails.

SAFE – If you have a dedicated email server with your own IPs, catch all emails may be safe for sending dependent on the overall health of your list.

DON’T SEND – If you use a third party email provider that requires a bounce rate below 4%, these emails are not safe for sending.

Unknown

We are unable to definitively determine this email’s status. This email appears to be OK, however the domain and/or server is not responding to our requests. This may be due to an issue with their internal network or expired domain names. Unknown addresses are checked up to 75 times before this result code is given.

SAFE – If you have a dedicated email server with your own IPs, unknown emails are normally safe for sending.

DON’T SEND – If you use a third party email provider that requires a bounce rate below 4%, these emails are not safe for sending.

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