We're seeing our deferred queues fill up with mail to Yahoo. Some mail appears to be delivering, but many are not. Is anyone else experiencing problems delivering mail to Yahoo? The Internet suggests that this error has been a result of Yahoo stability in the past. The following message is coming back: host mta5.am0.yahoodns.net[98.136.217.203] said: 451 4.3.2 Internal error

reading data (in reply to MAIL FROM command) lost connection with mta5.am0.yahoodns.net[98.136.217.203] while sending RCPT TO

​Thanks, Josiah​