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--- reference:smtp_spam_reduction [2014/06/10 11:30] – external edit 127.0.0.1
+++ reference:smtp_spam_reduction [2018/11/14 10:45] (current) – external edit 127.0.0.1
@@ Line 7: / Line 7: @@
 The system is too complex to go into here, but it essentially takes key parts of the message header, as well as the message body and creates a PKI digital signature on it, using a 'private key' on your system. The receiving end will find the same message header parts & body and verify the digital signature using a 'public key' which is distributed using the DNS system.
-If you have VPOP3 signing outgoing mail using Domainkeys, you should store the private keys in PEM format in a file called **domainkey_<domain name>_<selector>.PEM** in the VPOP3 directory. For instance **domainkey_pscs.co.uk_1.pem**
+If you have VPOP3 signing outgoing mail using Domainkeys, you should store the private keys in PEM format in a file called **domainkey_<domain name>_<selector>.key** in the VPOP3 directory. For instance **domainkey_pscs.co.uk_1.key**
+VPOP3 will automatically choose the appropriate private key file depending on the sender's email domain.
 One disadvantage of Domainkeys happens if some other software alters the message content. For instance, if something adds a 'this message has been checked for viruses', or a company signature, then that will alter the message content so that the domainkey signature will not be verified.

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