On Wed, 11 May 2011 13:10:31 -0700 Ted Mittelstaedt <t...@ipinc.net> wrote:
> Yahoo's SMTP mailers are unable to handle a standard > SMTP error 4xx, if they get one they abort the > transmission and return the message to the sender Do you have evidence to back up that claim? I don't believe it's true. We use greylisting and Yahoo's servers don't seem to have problems with it. It seems to me that Yahoo just isn't as good as Google or Hotmail at preventing spammers from signing up and at blocking outbound spam. Regards, David.
