Ideally, one would "stagger" a few techniques - with C/R at the tail-end to keep back-scatter at a minimum.
- Sniffer and all other tests during SMTP connection. Leave it up to the sending mail sever to notify its OWN users, it becoming the source of any back-scatter. - Gray-Listing doubtful emails (responding with 4xx to see if they will retry, at which point those will be done) - Gauntlet delay 30 minute those that didn't react appropriately to 4xx - Re-scan emails to see if they can be classified as spam by now (from BLs, URIBLs, content scanners, etc.) - For any remaining emails that still remain doubtful - offer C/R as final validation Of course, a C/R system should have a good size cache of recently challenged sender email addresses. NONE should get more than one C/R request, possibly listing a series of emails that are currently queued (from gray-listing, gauntlet, etc.). One approval will risk the assumption that this email address currently not being joe-jobbed and release ALL emails. -----Original Message----- From: community@mailsbestfriend.com [mailto:community@mailsbestfriend.com] On Behalf Of Michael Cummins Sent: Tuesday, November 04, 2014 8:29 AM To: community@mailsbestfriend.com Subject: [MBF] Re: Thoughts on how to deal with the current SPAM campaigns That all being said, I have some clients that have been using Sendio Appliances (it uses C/R) for years and to them the thing walks on water and makes cotton candy, too. For the right price, it would be an instant sell to many of my customers who primarily use mobile devices. The Sendio appliance isn't cheap, I hear (from them). Hence the line of questioning. If it makes my customers happy and they're eager to pay for it, then hey. My opinion doesn't necessarily need to override theirs. :) Michael Cummins ############################################################# This message is sent to you because you are subscribed to the mailing list <community@mailsbestfriend.com>. To unsubscribe, E-mail to: <community-...@mailsbestfriend.com> To switch to the DIGEST mode, E-mail to <community-dig...@mailsbestfriend.com> To switch to the INDEX mode, E-mail to <community-in...@mailsbestfriend.com> Send administrative queries to <community-requ...@mailsbestfriend.com>
