tir, 2002-04-23 kl. 12:41 skrev Mark Olliver: > can anyone think of a rule which check's if mail is coming from a valid > domain?
If you only receive mail from one or two mail hubs then you should be able to filter out other source IPs/networks, then protocol/port. If there are more, this would be a horrible job, especially since there's no file/db lookup possibility. IP numbers can and do change. > & or block mail from certain users/ domains. > also can we create iptables rules to block mail with certain messages, or > can't we see this at the packet level All of what you want can be done by a reasonably well configured mail server. My own speciality, Exim, can easily be configured for file, ldap and db lookups, relay hosts/domains, spam and virus filtering, authentication by 3 different methods, TLS/SSL encryption and more. Why try to reinvent the wheel? Tony -- Tony Earnshaw e-post: [EMAIL PROTECTED] www: http://www.billy.demon.nl gpg public key: http://www.billy.demon.nl/tonni.armor Telefoon: (+31) (0)172 530428 Mobiel: (+31) (0)6 51153356 GPG Fingerprint = 3924 6BF8 A755 DE1A 4AD6 FA2B F7D7 6051 3BE7 B981 3BE7B981
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