kylejginavan/sendgrid_smtpapi — pull request #3 by XurdeFdez (2013-09-23 08:30:20+00:00)
Title: Split JSON into several lines: By RFC 821 no line can be longer than 1,0...

According with section Requirements and Limitations from http://sendgrid.com/docs/API_Reference/SMTP_API/ the JSON need to be splitted into lines under 1000 characters.