We all know the fastest way to find a mistake is to hit “send” or “publish” (or whatever means “too late now!”).
If you’re sending out messages using an email marketing service (I like and recommend MailerLite), send yourself and at least one other person on your team a test email so you can check for accuracy and completeness. Otherwise, your message might look like this one that I recently received:
The footer has the instructions from the template: “Insert social links here – select the logos from the toolbar on the left side.”
I suspect the sender caught this mistake about two minutes after the message landed in thousands of inboxes. A simple test email sent ahead of time (and all the services allow you to send them) would have prevented it.