I upgraded to version 5.200 a week ago. Last Fri. I started noticing that the SMTP proxy has been failing to deliver mail intermittently. No error messages, mail is just lost in a "blackhole". Verified by sending MANY test messages. I can fix it every time by reseting the SMTP proxy. It happened 3 times that I know of, today!
Here's some errors I found from the log:
server_plain authenticator failed H=smtp-sbc-v1.mail.vip.sc5.yahoo.com [xx.xxx.xxx.137] 535 authorization failed (#5.7.0)
AND
R=smarthost T=remote_smtp defer (-42): authentication required but authentication attempt(s) failed
AND
R=smarthost T=remote_smtp defer (-53): retry time not reached for any host (This one is repeated MANY times!)
I am not using content filtering, spam filtering, or SMTP authetication. I do have smarthost enabled (obviously), with login and password. These settings have not changed since day one.
I'm positive it's not my ISP, because the problem is immediately resolved when re-starting the the SMTP Proxy!
This has never happened before, only after upgrade to 5.200. Any ideas?
Thanks,
Patrick
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