All things ISPs.
This is the space to share information about ISP requirements and what we know about delivering there. Let’s crowdsource a reliable set of resources about the rules we know at different ISPs. Please like and upvote posts you find useful to surface
Please use tags to identify which ISPs we’re talking about to help folks with search when they’re looking for information. (AOL/Yahoo, Gmail, Microsoft, O365, Google Workspace, etc).
When creating posts or replying to posts, please use the “public” tag if you’re OK with this information being included in public pages. Over time, we’re intending to make some information visible to non-logged in users, and posts tagged with public will be used as a basis for this information.
This is also the place to ask about emergent “anyone else seeing X” problems with specific ISPs. Please use the “timely” tag for these kinds of questions.