Greylisting is great until it delays your email login/signup verification codes for 20 minutes. Especially if they expire in 15.
I guess this only shows how email is used for entirely orthogonal purposes now.
I guess this only shows how email is used for entirely orthogonal purposes now.
On rare occasions I get frustrated by this, and I'm forced to login via ssh and manually permit a greylisted address through - though normally I am not so time sensitive. My greylisting is only 5 minutes.
Greylisting has been so effective for my personal email, I don't mind waiting a bit on the rare occasion (by now, most senders are already recognized). And on the rare occasion I get spam, it's been cathartic, adding a rule to reject the sender with a quippy SMTP eerror. It's also been easy enough just to forward it to abuse@google.com, because it's almost always from Gmail.
An Amazon verification email will be sent from "account-update@amazon.com". It's intuitive to predict "@amazon.com" so whitelisting works.
However, State Farm Insurance login verification codes are actually sent from "noreply@sfauthentication.com" instead of the "@statefarm.com"