First, it’s important to notice your perfectionist thoughts and feelings as they go through your head. If you do not notice them, you will automatically initiate perfectionistic behaviour which is what you want to get rid of.
Secondly, we must learn to see these perfectionist thoughts and feelings as thoughts and feelings and not as facts (truth).
Example: to read e-mails three times is not necessary, the colleagues don’t do it neither and that turns out okay.
Thirdley, we must be willing to endure these perfectionist thoughts and feelings until they automatically extinguish. We should not try to get rid of the perfectionistic thoughts and feelings by reassuring behavior (e.g. e-mail reading 3x). After all, reassuring behavior does not make you lose these troublesome thoughts and feelings forever.
Fourth, we need to know what our goal is and link it to our (target) behaviour. For example, my goal is to exhaust myself less, my target behavior is: e.g. not to read my e-mails unnecessarely. Please note, you will have to repeat this behavior frequently (read our e-mails only once) while you “hear” perfectionist thoughts and feelings in your mind. However if you continue to do so, you will find that your inhibiting perfectionist thoughts and feelings decrease.