Not receiving OPML backup after deleting sites

I have read some of the privacy concerns related to sending the backup OPML file when I delete sites. In this case, I’m not worried about the privacy, I’m worried about the lack of email. This week, I have deleted a few sites from my RSS feed, but the deletions never triggered the backup email. I have not made any changes to my account or to my email addresses, and the emails have not been flagged as Junk by Gmail. Any ideas?