On Mon, Mar 25, 2013 at 04:35:48PM +0100, Fabio Sangiovanni wrote:

> I'm trying to figure out how case sensitivity works in a
> check_recipient_access regexp table (Postfix 2.6.6).

Try the documentation:

    http://www.postfix.org/regexp_table.5.html
    http://www.postfix.org/pcre_table.5.html

    ...

       By default, matching is case-insensitive, and newlines are
       not treated as special characters. The  behavior  is  con-
       trolled  by  flags,  which are toggled by appending one or
       more of the following characters after the pattern:

       i (default: on)
              Toggles the  case  sensitivity  flag.  By  default,
              matching is case insensitive.


> /etc/postfix/check_recipient_access.regexp:
>     /^test@domain\.tld$/i    REJECT wrong format

See above and head the word *toggles* plus the default setting.

-- 
        Viktor.

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