SendEmail | uSpeedo

Send emails directly without using templates. Supports batch sending to multiple recipients. All recipients will receive emails with the same content.

Request Information

Request Method: POST
Request Path: /api/v1/email/SendEmail
Content-Type: application/json (use multipart/form-data when uploading attachments)

Notes

From value can be obtained from Domain Settings
To array length is limited to 1-100 email addresses
Subject length is limited to 1-200 characters
Html and Text: at least one must contain at least 1 character; Html takes priority over Text when Content is empty
Cc and Bcc recipients are combined with To, deduplicated, and delivered together; Cc + Bcc count ≤ 100
Attachments: max 10 files, total size ≤ 10MB; when uploading attachments, switch to multipart/form-data — attach files as form file fields, no manual Base64 encoding needed
Headers: array of {Name, Value} objects, max 20; Name allows only letters, digits, and -; reserved names (From, To, Subject, Reply-To, Content-Type, Mime-Version, X-SES-* prefix) are not allowed; Value must not contain newlines

Fromstringrequired

Sender email address

Tostring[]required

Recipient email address array (1-100)

Subjectstringrequired

Email subject, length 1-200 characters

Htmlstring

HTML email content

Textstring

Plain text email content

FromNamestring

Sender nickname

PreHeaderstring

Preview summary text shown next to subject in inbox

Ccstring[]

CC recipients, combined with Bcc max 100

Bccstring[]

BCC recipients, combined with Cc max 100

Attachmentsfile

Attachment list (JSON), max 10 files, total ≤10MB; use multipart/form-data to upload

Headersstring

Custom email headers (JSON array of {Name, Value}), max 20

Response Format

Field Name	Type	Description
RetCode	int	Return code, 0 indicates success
Message	string	Return message
SessionNo	string	Session number, used to query sending status

Error Codes

Code	Description
0	Success
215392	Invalid parameter
215397	Missing required parameter
215400	Server error

Update Notes (2026-07-28)

SendEmail / TargetEmailAddress / Content are deprecated — use From / To / Html (or Text) instead. Old fields still work but new fields take priority when both are provided.

LANGUAGE

CREDENTIALS

👁️

🔒

🔑Log in to get ACCESSKEY_ID and ACCESSKEY_SECRET

URL

POST

CURL Request▼

curl -X POST "https://api.uspeedo.com/api/v1/email/SendEmail" \
  -H "Content-Type: application/json" \
  -H "Accept: application/json" \
  -H "Authorization: Basic $(echo -n 'ACCESSKEY_ID:ACCESSKEY_SECRET' | base64)" \
  -d '{
  "From": "sender@example.com",
  "To": [
    "recipient1@example.com",
    "recipient2@example.com"
  ],
  "Subject": "Welcome to uSpeedo Email Service",
  "Html": "<html><body><h1>Welcome</h1><p>This is a test email.</p></body></html>",
  "FromName": "uSpeedo",
  "PreHeader": "Welcome to uSpeedo Email Service"
}'

RESPONSE

Click Try It! to start a request and see the response here.

Request Information​

Notes​

Response Format​

Error Codes​

Update Notes (2026-07-28)​