Re: [exim] EBL: blacklist for email addresses in Reply-To an…

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Autor: Lena
Data:  
A: exim-users
Assumpte: Re: [exim] EBL: blacklist for email addresses in Reply-To and message bodies
> The Reply-To: header takes an address-list and is interpreted as such,
> and IIRC used in that way by some mail-clients when subscribed to
> mailing-lists but wanting personal copies of replies too. So the `rt:`
> ACL is going to calculate something which will emit bogus queries to an
> external service.


I tested with `exim -be`. If Reply-To contains more than one address
then ${address expands into empty string, the ${if def
causes the code to not query anything:

rt:
  warn    set acl_m_rt = ${sg{${lc:${address:$header_Reply-To:}}}{\\+.*@}{@}}
    condition = ${if match{$acl_m_rt}{@???}}
    set acl_m_rt = ${sg{${local_part:$acl_m_rt}}{\\.}{}}@gmail.com


  deny    condition = ${if def:acl_m_rt}
    condition = ${lookup{${domain:$acl_m_rt}}nwildlsearch\
                     {MLDOMAINS}{0}{1}}
    dnslists = ebl.msbl.org/${sha1:$acl_m_rt}
    log_message = Reply-To: $header_Reply-To: in EBL: $dnslist_text \
        From: $header_From:, envelope-from $sender_address, \
        recipients=$recipients, Subject: $header_Subject:
    message = spam detected
          # 419 (Nigerian) scams often sent by humans, do not tell them
          # that the spam was detected with EBL http://msbl.org


accept