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curl "https://api.zeptomail.com/v1.1/email" \
        -X POST \
...
        "subject":"Test Email",
        "htmlbody":"<div><b> Test email sent successfully. </b></div>"
+}'

#!/usr/bin/perl
use strict; 
...
} else {
  print "$response->{'content'} $response->{'reason'}\n";
}

{"error":{"code":"TM_3501","details":[{"code":"GE_122","message":"Inva
+lid value found","target":"from"}],"message":"Unprocessable Entity","
+request_id":"2d6f.1281848db93b53d5.m1.659b6560-d7c7-11ed-90d9-525400d
+4bb1c.1876c4546b6"}}