Poor delivery can't be fixed with technical perfection

There are a number of different things delivery experts can do help senders improve their own delivery. Yes, I said it: senders are responsible for their delivery. ESPs, delivery consultants and deliverability experts can’t fix delivery for senders, they can only advise.
In my own work with clients, I usually start with making sure all the technical issues are correct. As almost all spam filtering is score based, and the minor scores given to things like broken authentication and header issues and formatting issues can make the difference between an email that lands in the inbox and one that doesn’t get delivered.
I don’t think I’m alone in this approach, as many of my clients come to me for help with their technical settings. In some cases, though, fixing the technical problems doesn’t fix the delivery issues. No matter how much my clients tweak their settings and attempt to avoid spamfilters by avoiding FREE!! in the subject line, or changing the background, they still can’t get mail in the inbox.
Why not? Because they’re sending mail that the recipients don’t really want, for whatever reason. There are so many ways a sender can collect an email address without actually collecting consent to send mail to that recipient. Many of the “list building” strategies mentioned by a number of experts involve getting a fig leaf of permission from recipients without actually having the recipient agree to receive mail.
Is there really any difference in permission between purchasing a list of “qualified leads” and automatically adding anyone who makes a purchase at a website to marketing lists? From the recipient’s perspective they’re still getting mail they don’t want, and all the technical perfection in the world can’t overcome the negative reputation associated with spamming.
The secret to inbox delivery: don’t send mail that looks like spam. That includes not sending mail to people who have not expressly consented to receive mail.

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Sept 17, 2019: Shutting down comments on this post because we cannot help you recover any email account and I am concerned about the number of people who are providing PII (including phone numbers, credit card numbers!!! and email addresses) in the comments. 

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Ownership of the inbox

Marketers often treat recipient inboxes with a certain level of ownership. They talk about getting mail to the inbox with the underlying implication that inboxes are for use by marketers and they tend to forget that recipients use email for a lot of things, not just being marketing targets.
This was crystallized for me a few years ago when I was running a conference session. The session had a very diverse group of attendees and as part of the session they broke up into smaller groups to talk about various email related topics. One of the questions was how do people use email. Those groups with more ISP representatives produced a list with dozens of ways people use email. The groups dominated with email marketers, though, came up with a much more limited set of uses, all of them related to marketing or commerce. They didn’t mention mailing lists or one on one discussions or connecting with friends as part of the things people use email for.
Marketers seem to forget that email was not adopted by users so they could be marketed to. In fact, email is primarily used by people to interact with friends, colleagues, allies and family members. Most recipients really don’t really care about marketing in their inbox. They’re much more interested in the mail from mom with pictures of the new puppy. They’re looking for that mail from a friend linking to a silly video. They’re deeply involved in an online discussion with friends or colleagues about anything at all.
This doesn’t mean they don’t want marketing in their inbox. Every subscription is an invitation to visit the recipient’s mailbox. They are inviting a sales person to visit them at home or at work;  spaces where marketers are not traditionally invited.
The problem is that a lot of email marketers do not respect the space they’ve been invited into. They assume, usually incorrectly, they are being given ownership of that space. The marketer sees the inbox as their marketing space, not as space that the recipient feels ownership over.
When someone buys a magazine or watches TV, there are a lot of ads, but that’s OK because they don’t feel any ownership of those spaces. But when they subscribe to something in email, they don’t cede ownership of their inbox to the senders. It is still their inbox and marketers are there only because the recipient invited them. The recipient will kick marketers out if they start writing on the walls or otherwise disrespecting their space.
Many delivery consultants talk about engagement and sending timely, relevant email. All of those are really coded phrases meaning “when you’re invited into somebody’s house don’t scrawl on the walls or poop on the carpets.”

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The view from a blacklist operator

We run top-level DNS servers for several blacklists including the CBL, the blacklist of infected machines that the SpamHaus XBL is based on. We don’t run the CBL blacklist itself (so we aren’t the right people to contact about a CBL listing) we just run some of the DNS servers – but that means that we do get to see how many different ways people mess up their spam filter configurations.
This is what a valid CBL query looks like:

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