Tip for women in tech:
You probably already do a quick scan of emails to look for typos and other mistakes.
Use that same time to edit out phrases that soften your points, excuse something that doesn't need to be excused, apologize when no apology is needed.
Every circumstance is different. I'm not saying this is always the right course. Sometimes you SHOULD apologize or have "In my opinion..." in your email. These are just general tips.
All of that being said, here's a list of the sorts of things to watch for.
"I think the best approach is to..." becomes "The best approach is to..."
You have expertise, not random thoughts. Don't downgrade it.