This is the best tip ever. At least for me it is, because I could have used this a long, long time ago.

Have you ever sent an e-mail and then regretted something you said, sent an e-mail to the wrong person or even forgot the attachment you said you would send? I have forgotten attachments so many times. It’s one of those things you should do before writing the actual e-mail content, but never seem to.

It turns out there is an option to defer delivery of e-mails for a length of time (in minutes). This applies to Outlook and I found out about this from How-To Geek. Too bad I stopped using Outlook for about half a year now.