RE: More Sendgrid trouble?

> >> Yeah, at this point, if I get anything from Outlook, Yahoo, Google,
> >> Mailchimp, Mailgun, OVH, or Sendgrid and it’s not a explicitly a
> >> whitelisted entry, I bounce it.
> >
> >I used a greylist where emails get a 4xx message with a link that
> allows the email through ...
> 
> Why would a mail system tell senders about a 4xx reply?  That means to
> try again, not to bounce it.
> 
> I realize that old versions of sendmail sent those annoying "your
> message has been delayed, retrying"

Sendmail as opposed to the "it is to difficult for me to configure sendmail so I use other" smtp servers?


> reports but I hope we all realize those are a mistake, at least for any
> mail system in this millenium.
> 

Yes makes sense, don't read what is in a dsn. What idiot ever designed such architecture.