Starting on January 3, 2006, it seems like delivery of emails sent with Postfix are delayed around 12 hours. I believe php's mail() function uses Postfix on the DreamHost servers.
In reply to the original poster, however, I haven't noticed any problems with my standard incoming/outgoing mail. It's only when I try to use the Postfix program directly from the command line that I'm seeing issues, and the problem just started on Jan 3. Anyone else having trouble with postfix or sendmail or PHP's mail() function?
~~~ Sanity Software ~~~
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