ACCESS(5)                                               ACCESS(5)


NAME
       access - format of Postfix access table

SYNOPSIS
       postmap /etc/postfix/access

DESCRIPTION
       The  optional access table directs the Postfix SMTP server
       to selectively reject or accept mail from or  to  specific
       hosts,   domains,   networks,   host   addresses  or  mail
       addresses.

       Normally, the access table is specified  as  a  text  file
       that  serves  as  input  to  the  postmap(1) command.  The
       result, an indexed file in dbm or db format, is  used  for
       fast  searching  by  the  mail system. Execute the command
       postmap  /etc/postfix/access  in  order  to  rebuild   the
       indexed file after changing the access table.

       When  the  table  is provided via other means such as NIS,
       LDAP or SQL, the same lookups are  done  as  for  ordinary
       indexed files.

       Alternatively,  the  table  can  be provided as a regular-
       expression map where patterns are given as regular expres-
       sions.  In  that  case, the lookups are done in a slightly
       different way as described below.

TABLE FORMAT
       The format of the access table is as follows:

       blanks and comments
              Blank lines are ignored,  as  are  lines  beginning
              with `#'.

       leading whitespace
              Lines  that begin with whitespace continue the pre-
              vious line.

       pattern action
              When pattern matches a mail address, domain or host
              address, perform the corresponding action.

PATTERNS
       With lookups from indexed files such as DB or DBM, or from
       networked tables such as NIS, LDAP or  SQL,  patterns  are
       tried in the order as listed below:

       user@domain
              Matches the specified mail address.

       domain.name
              Matches  the  domain.name  itself and any subdomain
              thereof, either in hostnames or in mail  addresses.



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ACCESS(5)                                               ACCESS(5)


              Top-level domains will never be matched.

       user@  Matches  all mail addresses with the specified user
              part.

       net.work.addr.ess

       net.work.addr

       net.work

       net    Matches any host address in the specified  network.
              A  network  address  is  a  sequence of one or more
              octets separated by ".".

ACTIONS
       [45]XX text
              Reject the address etc. that matches  the  pattern,
              and respond with the numerical code and text.

       REJECT Reject the address etc. that matches the pattern. A
              generic error response message is generated.

       OK

       Any other text
              Accept the address etc. that matches the pattern.

REGULAR EXPRESSION TABLES
       This section describes how the table lookups  change  when
       the table is given in the form of regular expressions. For
       a description of regular expression lookup  table  syntax,
       see regexp_table(5) or pcre_table(5).

       Each  pattern  is  a regular expression that is applied to
       the entire string being looked up. Depending on the appli-
       cation,  that  string  is  an  entire  client hostname, an
       entire client IP address, or an entire mail address. Thus,
       no  parent  domain  or  parent network search is done, and
       user@domain mail addresses are not broken  up  into  their
       user@ and domain constituent parts.

       Patterns  are  applied  in  the  order as specified in the
       table, until a pattern is found that  matches  the  search
       string.

       Actions  are the same as with normal indexed file lookups,
       with the additional feature that parenthesized  substrings
       from  the pattern can be interpolated as $1, $2 and so on.

BUGS
       The table format does not understand quoting  conventions.





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ACCESS(5)                                               ACCESS(5)


SEE ALSO
       postmap(1) create mapping table
       smtpd(8) smtp server
       pcre_table(5) format of PCRE tables
       regexp_table(5) format of POSIX regular expression tables

LICENSE
       The  Secure  Mailer  license must be distributed with this
       software.

AUTHOR(S)
       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA










































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