On Wed, 9 Jan 2013 13:29:06 -0200 Rafael Azevedo - IAGENTE <raf...@iagente.com.br> wrote:
> I was watching my log files now looking for deferred errors, and for > my surprise, we got temporary blocked by Yahoo on some SMTPs (ips), > as shown: > > Jan 9 13:20:52 mxcluster yahoo/smtp[8593]: 6731A13A2D956: host > mta5.am0.yahoodns.net[98.136.216.25] refused to talk to me: 421 4.7.0 > [TS02] Messages from X.X.X.X temporarily deferred - 4.16.56.1; see > http://postmaster.yahoo.com/errors/421-ts02.html > > So guess what, I still have another 44k messages on active queue (a > lot of them are probably to yahoo) and postfix is wasting its time > and cpu trying to deliver to Yahoo when there's an active block. > > Yahoo suggests to try delivering in few hours, but we'll never get > rid from the block if we keep trying while the block is active. > > This doesn't happens only with bulk senders. Many people use their > hosting company to send few hundreds emails together with many other > users sending legitimate mails from their mail clients… Eventually, > one user will compromise all infrastructure and many people may have > problem delivering their messages. > > There's gotta be a solution for this. There is - you need to register your mailserver(s) with yahoo. > > - Rafael
