That is a very good question to ask. Instead of theory, I would furnish a real-world checklist for you, which you can follow:
Step 1: Domain & Authentication (Non-Negotiable)
Before sending even a single campaign, make sure this is done:
✔ SPF is configured correctly
✔ DKIM is active and passing
✔ DMARC is set (at least monitoring mode)
If any of these are missing, ISPs already see your emails as untrusted — no matter how good your content is.
Think of this as your email identity verification.
Step 2: IP & Domain Warming (Still Critical in 2026)
A common myth is that I have a new server, so I’m safe.
Reality is something different
- New IPs = zero reputation
- New domains = zero trust
You must warm up gradually:
- Start small
- Increase volume slowly
- Keep sending patterns predictable
Skipping this step is one of the top reasons emails go straight to spam.
Step 3: Sending Consistency Beats Volume
ISPs don’t like surprises.
2 days silent →
200k emails in one blast
✔ Steady daily or scheduled sending
Consistency builds sender reputation faster than aggressive volume.
Step 4: List Quality > List Size
This is where many senders don't give much attention.
Check the below mentioned in your database.
- Are you sending to inactive users?
- Are bounced or complaint-heavy contacts still on the list?
Best practices:
✔ Suppress hard bounces immediately
✔ Monitor spam complaints closely
✔ Remove or re-engage inactive subscribers
A smaller clean list will always outperform a huge dirty one.
Step 5: Content That ISPs Trust
In 2026, spam filters don’t just read words, they analyze and focus more on behavior.
What helps:
✔ Balanced text-to-image ratio
✔ Natural subject lines (not clickbait)
✔ Clear unsubscribe option
✔ No misleading links
Your email should look like it was sent by a real business, not a machine.
Step 6: Sending Pattern & Batching Matters
Blasting everything at once is risky. Adopt the smarter approach:
- Send in batches
- Rotate IPs responsibly, you can handle this robustly in Mumara
- Avoid sudden spikes
This reduces pressure on a single IP and keeps your reputation stable.
Step 7: Monitor, Don’t Assume
Never assume deliverability is "fine". Always keep an eye on:
Open rates
Bounce rates
Complaint feedback
Inbox vs Spam placement
If numbers change suddenly, there is something problematic check thoroughly.
