I just tried to send one of the drafts, and I saw a brief message flash that said they resemble spam. So I guess I've got a yahoo email spam problem.
Baring you didn’t make a filter that applies to this email. You’ll want to insure your video security system isn’t sending out hundreds of emails per minute / hours.
As that will quickly get flagged by the ISP / Email provider.
As it relates to any kind of filter depending upon who your cell phone provider is (android / iOS).
Verify you haven’t moved anything to the junk / spam folder. Even worse placed a (block) on that sender address!
Depending upon the email provider and how it’s connected this action of (block) will cascade into the (Spam / Junk) folder rule set.
Let us know how things turn out and root cause.