I try to privately email other authors to let them know that the lack of a proofreader is obvious, but sometimes I can't find a way to do that. We all need proofreaders. We have what we want to write in our minds, and we type what we're thinking. We cannot proofread our own work, as our minds know what words are supposed to be there and we don't notice the mistake. It takes a separate person, reading someone else's work, to notice things that have gone awry.
A spell-checker program will only point out things that aren't correctly-spelled words. The program has no way to know that the correctly-spelled word used isn't the CORRECT word. Only a human reader will realize that there's something wrong.
-ZM