Error Codes

If your API call is unsuccessful, an error code and message will be returned in JSON. Below is a list of the error codes:

Code	Message
1	Missing SenderAPIKey
2	Missing FromName
3	Missing FromEmail
4	Missing ReplyToName
5	Missing ReplyToEmail
6	Missing ToName
7	Missing ToEmail
8	Missing Subject
9	Missing ContentType
10	Missing HTMLContent
11	Missing PlainContent
12	Invalid user
13	Invalid sender API key
14	Recipient email is suppressed
15	Invalid TemplateID
16	Invalid TargetListID
17	Email quota reached
18	Recipient name or email address is missing
19	Recipient email address is invalid
20	There is no recipient set for the email OR The number of recipients exceeds the allowed recipient email address count
21	CC name or email address is missing
22	CC email address is invalid
23	Invalid from email address format
24	BCC email addresses must be set as an array
25	BCC name or email address is missing
26	BCC email address is invalid
27	The number of BCC email addresses exceed the allowed email address count
28	Reply-To email addresses must be set as an array
29	Reply-To name or email address is missing
30	Reply-To email address is invalid
31	The number of Reply-To email addresses exceed the allowed email address count
32	Domain is not activated
404	Resource not found
422	Invalid request parameters
429	Too many requests

{
    "Errors": [
        {
            "Code": 13,
            "Message": "Invalid SenderAPIKey"
        }
    ]
}