tailieunhanh - Red Hat Linux unleashed Second Edition phần 3

Thời gian duy nhất bạn sẽ muốn có nguy cơ đóng cửa Linux thông qua một thiết lập lại cứng hoặc chuyển đổi điện-off trên máy tính của bạn IS nhanh chóng nếu bạn không thể giết một quá trình phá hủy, như vậy Như tình cờ rm-fr / *. | SMTP and POP 117 Chapter 7 The mailer is the name of one of the mailers you ve defined in an M command for example smtp. The host and user are usually positional macros taken from the Ihs match. See The Right-Hand Side rhs of Rules later in the chapter. After sendmail selects a mailer in ruleset 0 it processes sender addresses through ruleset 1 often empty and then sends them to the ruleset given in the s flag for that mailer. Similarly it sends recipient addresses through ruleset 2 also often empty and then to the ruleset mentioned in the R mailer flag. Finally sendmail post-processes all addresses in ruleset 4 which among other things removes the angle brackets inserted by ruleset 3. Why do mailers have different s and R flags Consider the previous example of the letter sent to joe@ and pinheadlzippy. If betty@ sends the mail her address must appear in a different form to each recipient. For Joe it should be a domain address betty@. For Zippy because expects old-style UUCP addresses and assuming it has a UUCP link to pinhead and s UUCP hostname is whizzer the return address should be whizzerlbetty. Joe s address must also be rewritten for the pinhead UUCP mailer and Joe s copy must include an address for Zippy that his mailer can handle. Processing Rules Within Rulesets sendmail passes an address to a ruleset and then processes it through each rule line by line. If the Ihs of a rule matches the address it is rewritten by the rhs. If it doesn t match sendmail continues to the next rule until it reaches the end of the ruleset. At the end of the ruleset sendmail returns the rewritten address to the calling ruleset or to the next ruleset in its built-in execution sequence. If an address matches the Ihs and is rewritten by the rhs the rule is tried again an implicit loop but see the and @ Altering a Ruleset s Evaluation section for exceptions . As shown in Table each rewriting rule is introduced by the R .

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