I need to edit my entries before posting them

I read an article a few days ago about editing. The article said that many writer do not edit their e-mail before sending them. I realized as I read the article that sometimes I do not edit my entries before posting them to any of blogs.

A writer's e-mail and blog give readers a impression of the persons talent and experience. These items need editing before sending or posting. Many times, these are the first things a potential publisher, therefore, they need to use proper punctuation, grammar, spelling, etc. Publishers form their first impression of a writer through these items, so perfection is necessary.

I make my entries directly into my blogs, after which I copy and past the item into a document. I then run the item through a grammar and spell checker. Some things a gramme and spell checker will not catch, but a reader will. These have to do with similar words that have different meanings, such as

1. There and their
2. Than and then
3. Your and you're (you are).

I know my weakness concerns then and than, so I have to be especially careful about these words.