Step-by-Step Checklist for Perfect Inbox Delivery in 2025
Follow this 2025 deliverability checklist to keep your emails out of spam and landing in inboxes every time.
Last updated
Follow this 2025 deliverability checklist to keep your emails out of spam and landing in inboxes every time.
Last updated
With smarter filters, AI-powered spam detection, and increased inbox competition, email deliverability has become more complex than ever. In 2025, getting your emails delivered isn’t about luck — it’s about process.
Whether you're doing , sending bulk campaigns, or managing transactional emails, this step-by-step checklist ensures every message has the best chance of reaching the inbox.
Let’s make perfect inbox delivery your new normal.
Before sending anything, make sure your domain is properly authenticated:
SPF — Lists servers allowed to send for your domain
DKIM — Validates your message hasn’t been tampered with
DMARC — Instructs inboxes on how to handle failed authentication
Use to monitor domain reputation and authentication health.
SenderWiz guides you through this during setup, so your DNS records are correct and aligned.
ISPs don't trust new senders. A warm-up strategy helps build your reputation slowly and safely.
Start with 50–100 emails per day
Increase volume every few days
Send to high-engagement contacts during warm-up
A dirty list leads to:
High bounce rates
Spam traps
Complaints
Lower reputation
Before every campaign:
Verify emails using a validator
Suppress inactive users
Remove role-based (e.g., sales@, admin@) and disposable addresses
Send only relevant emails to the right audience:
Use engagement history to segment
Personalize offers based on user behavior
Avoid one-size-fits-all campaigns
Repetition is a spam signal. Use rotation to:
Switch up subject lines
Rotate from names and addresses
Alternate parts of email body text
Sending at 9 AM local time is powerful — sending at 3 AM? Not so much.
Avoid peak spam filter hours (e.g., midnight blasts)
Stick to business hours
Adjust for local timezones
SenderWiz allows timezone-based delivery scheduling, including weekday-only options.
In 2025, ISPs reward high engagement. If you keep emailing users who ignore you, your inbox rates drop.
Track:
Opens
Clicks
Replies
Spam complaints
Then:
Remove cold contacts after 3–5 unengaged sends
Pause or suppress low responders
Your main ESP is good for newsletters or warm lists. But for cold or high-volume sends, a custom SMTP helps protect your primary domain.
Full control over sending
Isolated deliverability impact
Advanced warm-up and rotation support
Always run tests on:
Spam score
Mobile responsiveness
Broken links
Authentication pass/fail status (SPF, DKIM, DMARC)
Use tools like:
Mail-Tester
Spam score + setup analysis
Litmus
Email rendering
Google Postmaster Tools
Domain-level insight
After sending, check:
Inbox vs Spam placement
Bounce rates
Open rate by domain
Complaint rates
Use this data to adjust your content, send volume, and segmentation for the next campaign.
SenderWiz provides in-dashboard analytics and inbox monitoring tools so you can react fast.
💬 Keep your emails conversational, not robotic 🧠 Use AI to personalize content at scale ✉️ Limit image-only emails and avoid heavy HTML 📬 Always include an unsubscribe link 🕵️♂️ Watch your reputation score (especially with Gmail & Outlook)
Inbox placement in 2025 is the result of small, consistent best practices — not flashy hacks or ESP switching.
This checklist is your deliverability playbook. Follow it regularly, and your emails will land right where they belong — in front of your audience.
"Are you building habits that protect your inbox rate, or taking risks with every send?"
Need help implementing this checklist at scale?
from SenderWiz automates warm-up schedules for both SMTPs and domains.
Explore more to maintain a clean database.
SenderWiz enables deep segmentation with custom fields, tags, and dynamic filters — part of its core .
does this automatically for each campaign — no manual work required.
Read more on to improve results.
SenderAI gives you the power to create and manage your own SMTP with rotation and reply tracking — ideal for .
automates warm-up, rotation, segmentation, reply tracking, and smart scheduling — giving you perfect inbox delivery tools without the guesswork.