Starting this past summer, I noticed an uptick of reports amongst my readers that they weren't getting the daily email I send out. In about 99% of the cases, their e-mail provider had suddenly flagged the e-mail as spam, even though they had previously been getting it for weeks without any problems.

The best way to combat it (for me, at least), was to make a post explaining to my readers to add my e-mail to their contact list.