Check Your Spam or Junk E-mail Folder Daily.
E-mails end up in your spam/junk folder for any number of reasons, and unbeknown to you, you could be missing out on a communication from an editor.
It happened to me, even though I had the editor's e-mail address saved in my contacts folder: two emails went straight to spam and a third came through to my inbox. Luckily it wasn't too important as it wasn't for a writing gig but for having my details listed on a website. However, I did send an apology.
Now I check my spam/junk e-mail folders daily: no good opportunity is going to slip by me!