Strange Following.

Why do some follower notifications reach my inbox while others do not? I like receiving the friendly e-mail update "so-and-so is following you". It allows me to weed out and block strangers while affirming friends by following them in return. I receive maybe 10% of the actual new follower notices, though. :(

Example Good: Person A follows me. Twitter sends me an e-mail. I check, we're friends! I follow them. Or wait, I don't know this person, I block them.

Example Bad: I login today and find 5 new strange people following me. I don't know them and I never received notification for any of them.

Why are these notices not consistent?
 
indifferent I’m undecided
Inappropriate?
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