:: On Fri, 14 Mar 2014 13:51:37 -0000 :: <sig.91501147d0.000001cf3f8c$85a7ed20$90f7c760$@lanternhosting.co.uk> :: "Colin Waring" <co...@lanternhosting.co.uk> wrote:
> I was wondering if anyone else was seeing an increase in spam > messages that come with a valid DKIM signature? It has gotten to the > point where I have had to set DoDKIM to disabled because so much > rubbish is coming through and I can't think of many circumstances > where DKIM is actually used extensively. I don't think it's a DKIM issue (or an SPF one or whatever); see, the number of bots trying to bruteforce credentials (either over SMTP or POP3/IMAP) dramatically raised (and I'm not counting the malware which steals them from victim's machines) and once those credentials are upped to some botnet controller, the bots will just start pumping a lot of junk through a server using the stolen credentials and DKIM or SPF won't be able to do much; bottom line, ensure to check for bounces and keep an eye on your servers; as for bounces; if someone here is running on win and using the IIS SMTP as the outbound mail router, it may (will !) be a good idea to configure it to also send a copy of NDR emails to some mailbox you manage (say ndr...@example.com) so that you'll be able to see the bounces and take action (ok, this is a raw and straight approach but as a first step it's better than nothing) ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ Assp-test mailing list Assp-test@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/assp-test
