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Send Email

Send one plain-text or HTML email.

POSThttps://api.quantumtec.eu/v1/email/single

POST: X-ApiKey headerAuthentication

Availability

Reference for published API v1 Email and Viber methods. Confirm availability for your account with your account manager.

Request body

Request body
ParameterDescription
tostringrequiredRecipient email address.
fromstringrequiredSender email address.
textstringrequiredEmail body as plain text or HTML.
subjectstringrequiredEmail subject.
isHtmlbooleanrequiredUse true for HTML and false for plain text.
replyTostringoptionalAddress to receive replies.
MessageIdstringoptionalYour message ID. Assigned automatically when omitted.
cURL · POST
curl --request POST 'https://api.quantumtec.eu/v1/email/single' \
  --header 'X-ApiKey: YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --header 'Accept: application/json' \
  --data '{
  "to": "recipient@example.com",
  "from": "sender@example.com",
  "subject": "Test message",
  "text": "Hello",
  "isHtml": false,
  "replyTo": "reply@example.com"
}'

Attachments

Attachments
ParameterDescription
attachmentsarrayoptionalEmail attachments.
attachments[].fileNamestringoptionalFile name.
attachments[].contentTypestringoptionalFile content type.
attachments[].datastringoptionalFile contents; the published v1 guide does not specify the encoding.

Response

Response
ParameterDescription
messageIdstringMessage identifier.
sentstringSending time in UTC.
JSON response
{
  "messageId": "19905880-9404-4686-a8af-54af8888b96d",
  "sent": "2026-09-01T10:00:01.000Z"
}

Delivery reports

API v1 lists /sms/report and /sms/report/bulk in the shared reports section. It does not specify separate Email or Viber report URLs. Confirm which report method applies to your channel with your account manager.