I read in an agent blog today of a woman who hammered back at the agency with a long tirade of snide comments after receiving a rejection letter. I was horrified at her attitude.
Then I remembered a note by me to an agency about a year an a half ago where I frustratingly told them their standard rejection letter seemed very cold.
I have learned so much since then, and now look upon rejection letters as the things they truly are: not personal. It's a business. And a writer trying to sell a manuscript and enter into a business agreement should remember the other party has the right to reject it if it isn't good business for them.
Still, that comment I made might come back to haunt me when I start sending out query letters again. Yes? No? Probably wasn't memorable enough to stand out? Never darken an agent's door again?
To answer the second question first, no, that one agency will probably not remember you unless they rejected your full and you're resubmitting the same manuscript. And even then, it's one agency! There's over a hundred of them.
As to the first question, which was unasked, what is the deal with people complaining about personalized rejections? I mean it's still a rejection, but if you get a personalized rejection, it generally means we cared enough about your work to personalize our rejection. You were close. You were closer than about 95% of the applicants. Slap yourself on the back and then write something just a little bit better.