Understanding email deliverability requires sending emails that recipients have opted for. Many seek strict rules but true compliance stems from respecting the recipient's preferences. Although frustrations exist regarding the lack of clarity from Internet Service Providers, established guidelines do exist. Efforts to create comprehensible frameworks often reveal contradictions and a tangled understanding of email marketing. The recent publication of clear rules by services like Yahoo and Google illustrates that explicit regulations for deliverability are available and can be leveraged for success.
Anyone who has to know exactly what the rules are for inbox delivery is trying to figure out how close they can get to violating the rules without negative consequences. Senders that comply with the spirit of the rules don't care what the specifics of the rules are.
The gist of it all is: send email people have asked you to send them mail. That's it. Senders that do that generally don't have deliverability problems.
ISPs won't tell you what you need to do to get to the inbox and they won't tell you why you were blocked and they just leave to you figure it out.
After I wrote that, I thought that wasn't true at all. I realized we have a lot of explicitly stated rules.
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