If your sent emails are going to a spam folder, there are practices you can follow to get messages in your recipients' ...
My mail is hosted by Google, IMAP style. Most of the time, I use Sparrow to deal with my mail, but every now and then I open up Mail.app. When I do, Mail.app starts to frantically catch up with Google ...
Spam auto-deletes in Gmail after 30 days — but it can be helpful to check the folder to make sure useful messages aren't slipping through the cracks.