Rafael Azevedo - IAGENTE:
> 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
As required by RFC the Postfix SMTP client will try another MX
host when it receives a 4xx greeting.
Postfix limits the number of MX hosts to try.
When all greetings fail with 4xx or whatever then Postfix will
suspend deliveries.
Therefore, you are talking out of your exhaust pipe when you
claim that Postfix keeps trying.
Wietse
