title: Invalid SMTPAPI Header - SendGrid
body: <p>I am using SendGrid for an automated mailing system that I am developing.</p>
  
  <p>Unfortunately I am getting this error out of nowhere, on random occasions, from time to time.</p>
  
  <p>First I thought that I am exceeding the allowed 1000 chars line length, that was probably true, since after I've added "\r\n" in various HTML parts of the email, the error started occurring more rarely.</p>
  
  <p>The SendGrid "Support Engineers" are completely impotent when it comes to solving this isse.</p>
  
  <p>And still, this situation is very problematic for me, since it's one of the most crucial core feature of my system, and it must be solid and reliable.</p>
  
  <p>Thanks in advance for any assistance.</p>