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Old 21st December 2012, 09:25
till till is offline
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These emails are most likely inserted trough a website script e.g. like a vulnerable contact form or cms system, so blocking on postfix level will not work if you dont want to block all emails from localhost. Check the email content of one of the mails in the queue with postcat, it should contain additional info like the user which send the email so you can find the site which contains the script.
Till Brehm
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