I'll shill for a friend here: Michael W. Lucas, "Run Your Own Mailserver", Windmill Press, 2024. https://mwl.io/nonfiction/tools#ryoms It's not actually for anyone clueless, it has clues aplenty even for the clueful. -Adam -----Original Message----- From: Trevor Cordes <trevor@tecnopolis.ca> Sent: November 30, 2024 23:53 To: Scott Toderash <scott@100percenthelpdesk.com> Cc: Continuation of Round Table discussion <roundtable@muug.ca> Subject: [RndTbl] Re: shaw email blacklist On 2024-11-29 Scott Toderash wrote:
No, my server is the smarthost for a bunch of other servers that I run. Various Shaw customers are the recipients. Regular folks. Totally out of my control.
I am not a Shaw customer at all. That's what makes this more difficult. They appear to have a private blacklist and I wish I could find out more about it.
Ah, so you're a server somewhere external to shaw just trying to get your emails through to people with @shaw email addresses, eh? Yes, now RBLs make more sense. Are you getting blanket blocked by IP or just from-address blocked on certain domains you smarthost for? Or even just certain email addresses within a domain? Bounce or drops? Have you made sure you are passing all DMARC, SPF, DKIM? (See my presentation notes from May 7, 2024: https://muug.ca/meetings/23-24.html ) I do similar to you, at a pretty massive scale, and I've never noticed a problem with Shaw in particular. As all these companies (and their 3rd party providers) get stricter on DMARC/etc you may find RBL-like occurrences pop up -- but they are really DMARC/etc issues. Note, it looks like shaw outsources MX to cloudfilter.net, so you could investigate what they are doing for RBL and what they are requiring for DMARC, etc. (Turning on DMARC reporting temporarily may help troubleshoot.) _______________________________________________ Roundtable mailing list -- roundtable@muug.ca To unsubscribe send an email to roundtable-leave@muug.ca _______________________________________________ Roundtable mailing list -- roundtable@muug.ca To unsubscribe send an email to roundtable-leave@muug.ca