>On outgoing the spam sender is whitlisted forwarded mails out->in(FW)->out should be detected as redlisted mail by assp (redRe) redlisted mails never contributes to whitelist additions
>After a time >Web.de is blocking my Server IP. >Whats happend? This depends on the forwarding mechanism of your mail server/client. Forwarding an email, is a bad idea. If your mail server (client) provides a 'send a copy to' , use this mechanism. Let's say, the original mail was from gmail.com - it is forwarded to web.de through your server. Think about, what web.de sees: an email from gmail.com sent by your IP - web.de checks SPF -> fail! Your server or client modifies the mail subject (FW: is added for example) -> web.de checks the DKIM signature -> fail. Your server/client removes the DKIM signature - web.de knows, gmail has to have one -> fail. Worst case - spam is forwarded - web.de detects spam from your IP - report goes to RBL-providers - your IP will get globaly blacklisted after some time! I don't know, if web.de provides a whitepaper, how emails should be forwarded to them. There are several X-MIME headers that can be used to tag forwarded mail (like: X-Forwarded-For), but like all X-MIME headers - there is no 'have to' or 'must' - only a 'can'. It is allowed to ignore them all. An safe way to forward is: - use the local account as envelope sender - replace the from header address by the local account - put the original from address in to the 'Sender:' header line - possibly add the 'X-Forwarded-For' header - remove all DKIM or DomainKey signatures - remove all SMIME signature parts Someone would say: SRS is developed for this forwarding to solve the SPF failure - Yes, this is true, but I don't know any implementation for SRS at any of the large email providers. Thomas Von: Christian Leicht <use...@schani.com> An: For Users of ASSP <assp-user@lists.sourceforge.net> Datum: 23.08.2016 13:35 Betreff: [Assp-user] spam an forwarded email Hello, what can i do ? Some of my users get spam an (auto)forward all emails to a web.de Emailaddress. On outgoing the spam sender is whitlisted. After a time Web.de is blocking my Server IP. Whats happend? Thanks for a tipp Christian ------------------------------------------------------------------------------ _______________________________________________ Assp-user mailing list Assp-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/assp-user DISCLAIMER: ******************************************************* This email and any files transmitted with it may be confidential, legally privileged and protected in law and are intended solely for the use of the individual to whom it is addressed. This email was multiple times scanned for viruses. There should be no known virus in this email! *******************************************************
------------------------------------------------------------------------------
_______________________________________________ Assp-user mailing list Assp-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/assp-user
