title: Why email from my server is being marked as spam by popular clients?
body: <p>I am sending single letters of notifications, yet they are being marked as spam by almost every server.</p>
  
  <p>I've got detailed report from "is not spam" service, but can't really understand what lines of it are important. From what I have gathered by googling, everything looks moderately OK, yet emails end up in spam anyway.</p>
  
  <p>Please tell me, what am I missing.</p>
  
  <p><a href="http://isnotspam.com/dreport.php?id=42159&amp;email=gouf@4otaku.ru" rel="nofollow">http://isnotspam.com/dreport.php?id=42159&amp;email=gouf@4otaku.ru</a></p>