Resend SMS

Retry failed SMS messages intelligently with preserved original content, sender ID, and recipient information. Credits only deducted on successful delivery.

Resend Strategy Tutorial (2:45 mins)

How to implement smart retry logic for failed SMS

2:45

Original Message Preserved

Resend with exact same sender ID, content, and recipient - no reconfiguration needed

Credit Safety

Credits only deducted on successful retry - failed resends don't cost you

Smart Retry Logic

Automatic retry scheduling with configurable intervals and max attempts

Resend Analytics

Track resend success rates and identify problematic messages

Authentication Required

Use Basic Auth with your API credentials. The messageId must be from a previously failed or expired message.

Resend Policy

Only messages with status 'failed' or 'expired' can be resent. Successful messages cannot be resent - create a new message instead. Credits are only deducted when the retry succeeds.

Resend Success Rate

78%

First retry success rate

Avg Retry Time

3.2m

From failure to success

Max Retries

Per message lifetime

Expiry Window

48h

Message valid for retry

POST

/v1/sms/resend

Retry

Idempotent

Request Body

application/json

{
  "messageId": "exa_api_123456789_abc123def",
  "smsId": "clxyz123abc"
}

Response

{
  "success": true,
  "message": "SMS resent successfully",
  "data": {
    "messageId": "exa_resend_123456789_xyz789",
    "originalMessageId": "exa_api_123456789_abc123def",
    "status": "delivered",
    "recipient": "233555539152",
    "senderId": "YourBrand",
    "segments": 1,
    "cost": 1,
    "resendAttempt": 2,
    "deliveredAt": "2024-01-15T10:35:00Z"
  }
}

Recommended Retry Strategy

1 minute

Initial retry after failure

5 minutes

Second attempt with longer delay

15 minutes

Third attempt

30 minutes

Fourth attempt

1 hour

Final attempt before expiry

When to Resend

Network Failure

Carrier temporarily unavailable - automatic retry recommended

Queue Timeout

Message expired in queue - manual resend required

Provider Rejection

Check error code before resending

Implementation Examples

curl -X POST 'https://api.sendexa.co/v1/sms/resend' \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Basic YOUR_BASE64_CREDENTIALS' \
  -d '{
    "messageId": "exa_api_123456789_abc123def"
  }'

Resend Success Rates by Attempt

Attempt 1

78%

Attempt 2

65%

Attempt 3

42%

Attempt 4

23%

Attempt 5

12%

Resend Best Practices

Implement exponential backoff with increasing delays between retries
Differentiate between retryable and non-retryable errors
Set maximum retry attempts (5 is recommended) to avoid infinite loops
Use scheduled resends for network issues, immediate resends for queue timeouts
Track resend attempts to avoid duplicate retries
Consider time of day when scheduling retries (avoid midnight retries)
Monitor resend success rates to optimize your retry strategy