We were made aware of some issues with inadvertent unsubs from the mailing lists. To fix this we were forced to go full on with DMARC, DKIM, SPF, ARC, the whole enchilada. This will impact you, the user, in a very important way: the From: address in the header of emails you get from the mailing lists will now be from @muug.ca. Previously, they would be From: the actual person who sent the email to the list. (Look at the From: header and Reply-To: header of this email to get an idea of the change.) This will impact what happens when you press REPLY (and related buttons) in your MUA (your Outlook, gmail, thunderbird, etc). What exactly happens is up to your MUA. But now you have to be extra careful that you aren't sending a private/personal response (meant for the human sender) to the mailing list. Always check your To: and Cc: headers before you hit send! The opposite may happen too, a reply you want to go to the list may just go to the sender! Click your reply, reply-all and reply-sender buttons now to get a feel for what will happen (then hit cancel!). On my box/MUA, the reply-sender button is now useless (completely backwards). YMMV If you're interested in the full technical spiel feel free to ask me at the next meeting's roundtable! :-) If something doesn't work, email (right away!) the list, or email me directly with MUUG in the subject. (See this email's reply-to header.)