Tham khảo tài liệu 'tcp/ip network administration- p10', công nghệ thông tin, quản trị mạng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | file C mynapster Downloads warez tcpip specified by S and ruleset 4. The mailer definition for smtp in our sample configuration defines two rulesets for S - 11 and 31. 23 The first ruleset is used for rewriting the sender address in the envelope and the second is used to rewrite the sender address in the message header. 23 Many versions of sendmail define only one ruleset each for S and R. Based on the information in Figure and in the S field of the smtp mailer we know that the rulesets that process the message header sender address are 3 1 31 and 4. So we run sendmail with the -bt option and enter 3 1 31 4 craig at the command prompt. This command processes the sender address through each of these rulesets in succession. We also know that the envelope sender address is processed by rulesets 3 1 11 and 4. To test that we enter 3 1 11 4 craig. The results of these tests are exactly the same as those shown in the example above. The value of the M macro rewrites the hostname in the message sender address just as we wanted. The hostname in the envelope sender address is not rewritten. Usually this is acceptable. However we want to create exactly the same configuration as in the m4 example. The FEATURE masquerade_envelope command used in the m4 example causes the envelope sender address to be rewritten. Therefore we want this configuration to also rewrite it. The only difference between how the message and envelope addresses are processed is that one goes through ruleset 31 and the other goes through ruleset 11. The tests show that both rulesets call ruleset 51 and then ruleset 61. They diverge at that point because ruleset 31 calls ruleset 93 and ruleset 11 calls ruleset 94. The tests also show that ruleset 93 provides the address rewrite that we want for the message sender address while the envelope sender address is not processed in the manner we desire by ruleset 94. The code for rulesets 94 11 and 31 is shown below Ruleset 94 -- convert .
