Email Deliverability Guide
Web Lead HQ
The Hidden Problem That Hurts Your Email Campaigns
Your email campaign may look perfect. A strong subject line. Good content. A clear call to action. You send it to 10,000 people and expect results. But here’s the truth: A large portion of your emails never reach the inbox. Some go to spam. Some get blocked. Some never appear at all. This is called a deliverability problem, and it can seriously hurt your results without you even noticing.
Why Good Emails End Up in Spam
Email providers like Gmail, Outlook, and Yahoo receive billions of emails every day, and their main goal is to protect users from spam, scams, and fake messages rather than simply delivering everything sent to them. Because of this, they do not read your emails like a human would; instead, they rely on technical signals and behavior patterns to decide where your message should go. These signals include your sender reputation, spam complaints, email authentication status, user engagement such as opens and clicks, the quality of your content, the health of your contact list, and your sending behavior such as how quickly or frequently you send emails.
What Email Deliverability Actually Means
Your email campaign may look perfect with a strong subject line, good content, and a clear call to action, and you expect great results when you send it to 10,000 people. But the real truth is that a large portion of your emails never actually reach the inbox where they can be seen. Some messages go straight into spam folders, some get blocked by email providers, and some never appear at all for the recipient. This issue is called a deliverability problem, and it can quietly damage your campaign performance without you even realizing what went wrong.
Web Lead HQ
The Technical Stuff That Actually Matters
SPF (Sender Policy Framework)
What it is: A list of servers allowed to send email on behalf of your domain
Why it matters: Without SPF, anyone can pretend to be you. ISPs don’t trust emails that can’t prove their origin.
How to fix it: Add an SPF record to your DNS settings. It looks like this: v=spf1 include:webleadhq.com ~all
Your email platform should provide exact instructions. This takes 10 minutes and solves a massive problem.
DKIM (DomainKeys Identified Mail)
What it is: A digital signature that proves your email wasn’t modified in transit
Why it matters: Email can be intercepted and changed. DKIM proves what you sent is what they received.
How to fix it: Your email platform generates a DKIM key. You add it to your DNS. Again, follow your platform’s instructions—it’s easier than it
sounds.
DMARC (Domain-based Message Authentication, Reporting, and Conformance)
What it is: Instructions for what ISPs should do if SPF or DKIM fails
Why it matters: Without DMARC, ISPs guess what to do with suspicious emails. With DMARC, you tell them.
How to fix it: Add a DMARC record to DNS that tells ISPs to reject emails that fail authentication: dmarc@yourdomain.com
Important: Set up SPF and DKIM first. DMARC builds on those.
List Hygiene: The Foundation of Deliverability
Here’s something most marketers don’t want to hear: a smaller, engaged list outperforms a large, inactive one every single time.
Remove these people from your list:
Here’s something most marketers don’t want to hear: a smaller, engaged list outperforms a large, inactive one every single time.
Remove these people from your list:
Hard bounces – Email addresses that don’t exist. Remove them immediately.
Repeated soft bounces – Full inboxes or temporary issues. If it happens 3+ times, they’re gone.
Never-openers – Haven’t opened an email in 6+ months? They’re hurting your reputation.
Spam complainers – Someone marks you as spam? Remove them fast. ISPs track this closely.
Role addresses – admin@, info@, sales@ rarely get monitored and often cause problems.
One of our customers removed 40% of their list — Yes, 40%—after realizing they were paying to email people who never engaged. Their open rates jumped from 15% to 34%, and their revenue per campaign doubled. Same emails. Better audience.
The Warm-Up Process (For New Senders)
Starting with a new domain or IP address? You can’t just blast 50,000 emails on day one.ISPs treat new senders like strangers. You need to build trust gradually:
Week 1: Send to your 50-100 most engaged subscribers
Week 2: Increase to 200-500 Week
Week3: Double again to 500-1,000
Week 4: Keep doubling until you reach full volume
This process takes 4-6 weeks, but it’s the difference between landing in inboxes and getting blocked entirely.
DKIM (DomainKeys Identified Mail)
Shared IP vs. Dedicated IP
Shared IP – You share an IP address with other senders. Good: lower cost, established reputation. Bad: someone else's bad behavior can hurt you.
Dedicated IP – You get your own IP address. Good: complete control. Bad: you're starting from zero reputation and need to warm it up.
For most businesses sending under 100,000 emails per month, shared IPs work great—if you're with a good provider who maintains clean infrastructure.
Custom domain for sending:
Don't send from your main company domain (company.com). Use a subdomain (mail.company.com or emails.company.com).
Why? If something goes wrong with your email sending, it won't hurt your main domain's reputation.
Monitoring Your Deliverability
The Deliverability Checklist
SPF, DKIM, and DMARC are set up correctly
List has been validated recently
Hard bounces and complainers removed
Sending from a warmed-up domain/IP
Subject line and content avoid spam triggers
Clear from name and working reply-to address
Prominent, easy-to-find unsubscribe link
Mobile-friendly design
Sending to engaged subscribers who opted in[ ] Content provides genuine value