Gmail (thus Nanog) rejecting ipv6 email

Mon Apr 4 15:17:36 UTC 2022

> Accepting mail for delivery, and then either silently dropping it, delaying it for days, or putting mail that in no way resembles spam into a spam folder seems a little worse than “doing what the standards say”. If you’re going to decide, on little or no evidence, that a message is spam or otherwise does not deserve to get delivered, the least you could do is to bounce it so that the sender is aware. No need to generate a bounce mail that could turn into backscatter; just reject the mail during the SMTP exchange.
> 
> Jim Shankland

I think they have turned some knobs recently (or rather, they 
continuously do). Yesterday's soft reject (i.e. mail ending up in the 
spam folder) became a hard reject. I guess it's possible to argue both 
ways - at least the soft reject could be trained not to categorise real 
mail as spam. With a hard reject that problem is shifted entirely to the 
sender.

Robert