this is probably a disk overload problem:

Oct 30 00:25:35 mybox postfix/smtp[2260]: 871931CDB1: to=<xxxxxxxx>, relay=mx2.mail.yahoo.com[4.79.181.136]:25, delay=0.65, delays=0.01/0.0 1/0.52/0.1, dsn=4.0.0, status=deferred (host mx2.mail.yahoo.com[4.79.181.136] said: 451 Message temporarily deferred - [170] (in reply to end of DATA command))

.... the msg was completely delivered to yahoo MX, but when Yahoo then tried to write the msg to disk at the end of the DATA command, it probably failed due to too busy disk and told the sender to try again later.

Len


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