Hi everyone, For the past 10 days, our mail exchange server has been getting flooded with emails. It appears that an attacker is sending out tons of spam through various open relays and using our address ([EMAIL PROTECTED]) in the return path. so essentially, all bounced emails are coming back to our mail server - we're seeing about 30,000 NDRs per day. I am using filters to delete the incoming email, but does anyone else have any other ideas on how to get this stopped? Since the NDRs are coming from legitimate sources, checking for open relays wont do me any good.
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