Weird mail script error

Hi people,

Since December 28th or so our site has experienced weir emailing problem that Dreamhost or programmer can’t figure out. We use custom server based customer service system that mails automatic emails whenever reply is made etc. However, most of these emails dont go through and following error report arrives:

This is the Postfix program at host

I’m sorry to have to inform you that your message could not be
be delivered to one or more recipients. It’s attached below.

For further assistance, please send mail to

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The Postfix program

<@ email removed for privacy : host[ip removed for privacy reasons] said: 554
<@ email removed for privacy >: Recipient address rejected: Policy Rejection:
Mysterious Error. (in reply to RCPT TO command)

We also have PHP based shopping cart that has started to do the same but with only minority of the orders.

Our guesses for source of this problem so far are spam related problem at Dreamhost side or recent changes at our site (shopping cart was recently updated to be more secure against spammers attempts to use functions to send spam) .

Dreamhost support says this is a script based problem.

Can anyone advice us what’s the problem or have you experienced similar problems in last two weeks or so?


Happy dreamhoster since 2003