[throwawayagency]

Thank you very much for your response. I appreciate it.

[jf22]

In writing could bite you in the ass later.

I wouldn't put those type of accusations in writing.

[duncan_bayne]

In writing will provide a paper trail that may later prove very handy.

E.g. "oh yeah, that guy: I fired him for poor performance." How would you prove otherwise without a paper trail?