Since rejections are all vanilla, generic and boilerplate yakety yak, it is nice when professionals write about rejection details. I am proud to present the following post with it's informative links:
This post, from Laurie Pawlik-Kienlen, originally appeared on her Quips and Tips For Successful Writersblog on 10/24/08. Even if you intend to self-publish, this list of traps to avoid will still have some applicable wisdom for your work-in-progress.
These 17 reasons book manuscripts are rejecte...
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Nobody likes rejection...in ANY form. But, as writers, rejection is just part of the business. You just have to develop a thick skin and an attitude of "I write for my own enjoyment and from my own exclusive imagination and I realize everybody won't like the same thing...So, I'm just not going to worry about it." 
Writer, Old-Warrior-Adventurer, Blogger... I was born in Key West, Florida. A rather famous hangout for some past famous writers: Hemingway and Tennessee Williams to name two. I just hope that I possess a glimmer of their talent. I have a bachelors degree in architecture/construction and a master's degree in industrial engineering. I have been writing for fifty plus years. Most of my writing has been in the technical, instructional and business areas. I am working on my first book: "Havana Harvest---When Cuba Was Naughty" which details my coming of age experiences in 1958 Havana, Cuba, at the age of 15. Please visit my other blog "Writers Welcome Blog" at http://alturl.com/4z88.