>I'm pretty certain that one or more of our domains have been BlackListed by >SpamCop and some ISPs for previously being open relays. When this occurs, >is the blocking done by domain name, mail server name, or IP address?
In about 95% of the tests, it is done by IP address. There are a few tests that are based on the domain name, but they aren't commonly used to block mail. >Our Imail rep mentioned that Scott Perry has previously posted a way to search >to see specifically which, if any, of your mail servers/domains are being >blacklisted. Scott, can you point me to that resource? Yes: http://www.DNSstuff.com . Just enter the IP address of your mailserver in the "Spam Database Lookup" box, and it will quickly let you know which spam tests list your mailserver. >Finally the obvious question: what's the best way to remedy the situation? IMail's SMTP Security options have a number of relaying choices. Of them, only 2 can be used safely (the rest cause you to be an open relay). The two safe options are "Relay for Addresses" and "No Mail Relay". If you use IMail's "Relay for addresses", you need to enter a list of "safe" IP addresses that your users may come from; anyone not coming from those IPs would need to use SMTP AUTH. If you use "No mail relay", everyone must use SMTP AUTH to relay mail. The relay settings apply only to outgoing E-mail, so no matter what your settings are, your users will still be able to get mail. -Scott --- [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)] To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
