Ever send an email to a group only to discover that the embedded link was the wrong one?
Ever email your subscribers about this year's event only to learn later that the info included was for last year?
It is worth repeating, and can never be overemphasized: PROOFREAD your emails before hitting SEND.
If it is a business email, the best idea is to routinely request help from another set of eyes to look at your message, both looking for simple errors and content misperceptions or improvements.
Simple reminder on proofreading >>