Valid 

– verified and real emails, which accepts mails.

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

Invalid

– a bad recipient address that doesn't exist or is not accepting mail

DON’T SEND – these emails do not exist and are not safe for sending, can result in a bounce.

Disposable

– 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.

Accept All (Unverifiable) 

– a domain-wide setting where all emails on this domain will be reported as an "accept all". There is no definitive way to determine whether this email is valid or invalid.

An accept all address is commonly used in small businesses to ensure a company receives any email that has been sent to them. Oftentimes these are in fact 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, accept 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

– emails with status impossible to determine. 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. 

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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