Dan is our customer support guy. He’s the one you talk to whenever you click the "Live Chat" button if you have a problem or question in MailChimp. Needless to say, Dan has seen a lot of "oopsies."
I overheard him giving one of our customers a nice tip:
Let’s say you just finished building your email campaign, and you’re ready to send it to your list. Even if you know it’s ready to go, always schedule it for later. You can set it to 15 minutes from now, 30 minutes from now, whatever. Just don’t send it NOW. Because after you click the submit button, you will inevitably think of something you forgot to add. Or some link you coded wrong. You always have last minute changes. Scheduling for later gives you some time to jump back in and edit.
And here’s a related article over at AWeber