We didn't pay, and found another way to send to the recipient. If you do choose to go with an RBL, make sure that it is reputable we were once added to a database for an unknown reason and were asked to pay a sum of money to be removed. We used to use one but it didn't seem to reduce the ammount of spam we received. In short, I have mixed feelings about RBLs. We're also looking at using PTR lookups so that we can avoid receicing spoofed messages and therefore avoid sending NDRs to spoofed addresses, but we have a lot of very small agents that we receive mail from, and I'm fairly sure that a lot of these won't have PTR records for their mail servers. We're looking at using LDAP lookups from our mail gateway to avoid our Exchange servers sending NDR's and combat this problem (If we drop the message at the connection level, then the sender server will send an NDR, rather than having our gateway accept the message and then pass it on to Exchange who then NDRs). According to Spamcop, the message is unsolicited, therefore our mail server is effectively sending spam. In other words, a spammer spoofs the sender address of a message that is send to a recipient that doesn't exist at our domain, so our Exchange server server sends an NDR to the spoofed address. One of our mail servers was recently added to the spamcop database because of our mail server was sending NDR's to spoofed addresses.
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