The status_code returned by the Fraud Prevention API is a number ranging from 5-999. It will always be present in the response, and it describes the detailed validation results. The table below shows the list of all possible status codes, their description, and respective status.

Code	Status	Description
5	unknown	Timeout. Did not get a response in time.
10	valid	The syntax is correct.
20	valid	The syntax is correct, and the domain is valid.
45	valid	The domain is a catch-all and does not support individual email address validation.
50	safetosend	The email address is valid and guaranteed SafeToSend.
55	valid	The address is allowed by a client-configured exception.
100	invalid	General syntax error in the email address.
110	invalid	Invalid character in address.
115	invalid	Invalid domain syntax.
120	invalid	Invalid username syntax.
125	invalid	Invalid username syntax for that domain.
130	invalid	The address is too long.
140	invalid	Address doesn’t have a username.
145	invalid	Address doesn’t have a domain.
150	invalid	Address doesn’t have an @ sign.
155	invalid	Address has more than one @ sign.
200	invalid	Invalid top-level domain (TLD) in address.
210	invalid	The address contains an extra space or character.
215	invalid	Unquoted spaces not allowed in email addresses.
255	invalid	The email address is not allowed due to client-configured suppression.
310	invalid	Domain doesn’t exist.
325	invalid	Domain can’t receive email.
400	invalid	Mailbox doesn't exist.
410	invalid	The mailbox is full and can’t receive email.
420	invalid	Mail isn't accepted for this domain.
500	invalid	Emails with that username aren’t accepted.
505	invalid	Emails with that domain aren’t accepted.
510	invalid	That address isn’t accepted.
520	invalid	The address matched to known bouncers (optional feature).
525	trap	The email address is a spam trap or is suppressed.
530	trap	Address has opted out from commercial email.
535	trap	The email address is on ANA's "Do Not Email List". (optional feature)
540	trap	The email address belongs to a known or frequent complainer.
999	unknown	System error.