[Freedombox-discuss] greylisting = foolishness ? [Re: Email on the FreedomBox Discussion]

[Tony Godshall]

...
> Indeed, some foolish anti-spam systems work by rejecting every message
> the first time they receive it, with a "temporary problem, retry
> later" error code.  Their theory is that REAL mail will get retried later
> but spam-sending software won't bother retrying.  (This is foolish
> because it delays all valid mail -- and it assumes spammers can't use
> queueing software.)

Not so much "can't" as much as "don't generally".
Greylisting decimated the volume of spam to be
processed on my domains (yes, about 1/10) at a
cost of about 10 minutes on first message.

However, it turns out the company that my credit
union uses to send out their notifications notifications
also can't be bothered- I ended manually exempting
them after about a dozen go-arounds of "your email
address is invalid"/"but it works for everyone else"

Tony