Before this course: Email Campaigns: automations and segments (course 3.5.2). You already have a consented list, segments, welcome and follow-up automations, and the basics from Email Marketing & Building a List (course 3.5). Here you make sure your messages arrive and you learn to test and measure them like a professional.
How email reaches the inbox
A letter can be perfect and still get lost if the post office does not trust your return address. Inbox providers are post offices. They look at who you are, how people treat your mail and whether you follow their rules.
- Delivered means the receiving server accepted the email. Inbox placement means it went to the main inbox, not spam or a promotions tab. A message can be delivered and still land in spam, so "delivered" is not the same as "seen."
- Inbox providers decide with signals: whether your email is authenticated (lesson 2), your reputation (how people have treated your mail before) and your content and links.
- Reputation is built from behaviour: low spam complaints, few bounces, people who open, click and reply, and steady sending.
- Gmail and Yahoo published stricter sender rules in 2024 that many other providers follow in spirit. Google's guidelines say that all senders must set up SPF or DKIM, use TLS, have valid DNS records and keep the spam rate in Postmaster Tools below 0.3%. Google also recommends staying below 0.10%.
- Bulk senders (Google: more than 5,000 messages a day to Gmail accounts) must also use SPF, DKIM and DMARC and support one-click unsubscribe for marketing messages.
- Yahoo's published rules are similar: authentication, a spam rate below 0.3%, and for bulk senders one-click unsubscribe, a visible unsubscribe link and honouring unsubscribes within 2 days.
- Rules and numbers change, so check the provider pages on the day you plan your programme.
| Idea | Simple meaning |
|---|---|
| Authentication | Proof the email really comes from you |
| Reputation | How receivers remember your past mail |
| Engagement | Do people want it (clicks, replies, not deleting unread) |
| Complaints | People pressing "report spam" |
- Write down the domain you send from (for example mail.yourbusiness.com).
- Find your daily sending volume. Is it near 5,000 messages a day to any one provider? (Most small senders are not.)
- Open Google's sender guidelines page (link in Sources) and note the all-senders rules.
- Open Yahoo's sender best-practices page and note the differences.
- Write a one-page "where we stand" list with a tick or cross for: SPF or DKIM, TLS, unsubscribe, spam rate known.
- Circle the crosses. They are your work list for lessons 2 to 4.
- Check: you can explain in two sentences the difference between "delivered" and "in the inbox."
Videos by other creators on YouTube, for reference. They are not made by or affiliated with The Future Market.
Read the video script
[Host] "Delivered is not the same as read. Delivered just means the server said okay."
[Screen: inbox, spam folder and promotions tab] "Your email can land in any of three places."
[Text on screen: Authentication. Reputation. Engagement. Complaints.] "Providers judge you on proof, past behaviour, engagement and complaints."
[Text on screen: Spam rate under 0.3%] "Google and Yahoo say keep spam complaints below zero point three percent."
[Host] "Earn trust first. Then test."
Write a "where we stand" checklist for your sending setup using the Google and Yahoo pages. Mark what is done, what is missing and what you do not know yet.
ClaudeStuck? Copy a ready-made prompt for Claude
Copy this, open Claude, paste it, and Claude will walk you through the lesson step by step.
For a grown-up: Claude is for adults (18+). Copy this, paste it into Claude, and use the answer to explain the lesson to your child.
I'm learning "Email Strategy: deliverability and testing" on The Future Market. Lesson 1: "How email reaches the inbox". What the lesson teaches: - Delivered means the receiving server accepted the email. Inbox placement means it went to the main inbox, not spam or a promotions tab. A message can be delivered and still land in spam, so "delivered" is not the same as "seen." - Inbox providers decide with signals: whether your email is authenticated (lesson 2), your reputation (how people have treated your mail before) and your content and links. - Reputation is built from behaviour: low spam complaints, few bounces, people who open, click and reply, and steady sending. - Gmail and Yahoo published stricter sender rules in 2024 that many other providers follow in spirit. Google's guidelines say that all senders must set up SPF or DKIM, use TLS, have valid DNS records and keep the spam rate in Postmaster Tools below 0.3%. Google also recommends staying below 0.10%. - Bulk senders (Google: more than 5,000 messages a day to Gmail accounts) must also use SPF, DKIM and DMARC and support one-click unsubscribe for marketing messages. - Yahoo's published rules are similar: authentication, a spam rate below 0.3%, and for bulk senders one-click unsubscribe, a visible unsubscribe link and honouring unsubscribes within 2 days. - Rules and numbers change, so check the provider pages on the day you plan your programme. The exercise I'm working on: Write a "where we stand" checklist for your sending setup using the Google and Yahoo pages. Mark what is done, what is missing and what you do not know yet. I'm stuck. Please: 1. Explain the main idea in plain, simple words with one everyday example. 2. Walk me through the exercise one small step at a time. Ask me what I've done so far before giving the next step. 3. Don't just give me the final answer. Help me do it myself, and check my work when I share it.
I'm a parent helping my child (about 8 years old) with a lesson called "How email reaches the inbox" from the course "Email Strategy: deliverability and testing". Here's what the lesson says: A letter can be perfect and still get lost if the post office does not trust your return address. Inbox providers are post offices. They look at who you are, how people treat your mail and whether you follow their rules. The activity: Write a "where we stand" checklist for your sending setup using the Google and Yahoo pages. Mark what is done, what is missing and what you do not know yet. Please explain this so an 8-year-old understands: short sentences, a fun everyday example, and no hard words. Then give me 3 simple questions I can ask my child to check they understood, and a way to do the activity together, one tiny step at a time.
Sources
- Google, Email sender guidelines: support.google.com/a/answer/81126
- Yahoo, Sender best practices: senders.yahooinc.com/best-practices/
Authenticate your domain: SPF, DKIM, DMARC
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List health: bounces, complaints and quiet subscribers
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Easy unsubscribes, clear consent and clean content
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Test subject lines and offers properly
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Revenue per email and what it really tells you
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Monitor, respond and run the programme
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Final project
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Quiz
What is the difference between "delivered" and "in the inbox"?
Delivered means the server accepted the email; it can still land in spam.
What do Gmail and Yahoo ask senders to keep the spam complaint rate below?
0.3% (Google recommends below 0.10%).
What does SPF do?
Lists which servers may send email for your domain.
What does DKIM do?
Adds a signature that shows the message is from you and unchanged.
What does DMARC tell receivers?
What to do when SPF and DKIM checks fail, and where to send reports.
What DMARC policy is a safe place to start?
"none", to monitor before tightening.
What is a hard bounce and what should you do?
A permanent failure; stop sending to that address.
Why are open rates unreliable?
Apple's Mail Privacy Protection hides real opens.
Why does an easy unsubscribe help delivery?
People who cannot leave may report spam, and complaints hurt reputation.
Which metrics are better winners for a subject-line test?
Clicks or revenue.
What is a holdout group for?
To see what extra sales the email caused.
How do you calculate revenue per email?
Revenue linked to the campaign divided by emails delivered.
Why should you check unsubscribes and complaints next to revenue?
A high-revenue campaign can still harm your list and reputation.
If complaints suddenly rise, what is the first step?
Pause large sends and send only to your most engaged segment while you find the cause.
Final exam
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Certificate
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