Skip to main content
POST
/
api
/
v1
/
email-campaigns
/
send-email-thread
curl -X POST "https://server.smartlead.ai/api/v1/email-campaigns/send-email-thread?api_key=YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "campaignId": 12345,
    "emailStatsId": "abc-123",
    "emailBody": "Thanks for your interest! Let me know if you have any questions.",
    "addSignature": true
  }'
Send replies to leads directly from the inbox. Maintains thread continuity and tracks all responses.

​
Overview

Sends a reply email to a lead, maintaining the email thread. Can send immediately or schedule for later. Key Features:
  • Thread continuity maintained
  • Optional scheduling
  • CC/BCC support
  • Attachments support
  • Signature inclusion
  • Reply tracking in conversation history

​
Query Parameters

​
api_key
string
required
Your SmartLead API key

​
Request Body

​
campaignId
number
required
Campaign ID
​
emailStatsId
string
required
Email stats ID for the message to reply to
​
emailBody
string
required
Reply email body content
​
id
number
Thread ID (optional)
​
toEmail
string
Recipient email (optional, defaults to lead email)
​
toFirstName
string
Recipient first name (optional)
​
toLastName
string
Recipient last name (optional)
​
scheduledTime
string
Schedule send time (ISO 8601 format)
​
replyMessageId
string
Message ID being replied to
​
replyEmailBody
string
Original email body being replied to
​
replyEmailTime
string
Original email timestamp
​
cc
string
CC recipients (comma-separated)
​
bcc
string
BCC recipients (comma-separated)
​
scheduleCondition
string
Scheduling condition (optional)
​
addSignature
boolean
Include email signature
​
seqType
string
Sequence type (optional)
​
attachments
array
File attachments array
curl -X POST "https://server.smartlead.ai/api/v1/email-campaigns/send-email-thread?api_key=YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "campaignId": 12345,
    "emailStatsId": "abc-123",
    "emailBody": "Thanks for your interest! Let me know if you have any questions.",
    "addSignature": true
  }'