How to improve email deliverability with automation
Quick Answer: To improve email deliverability, configure SPF, DKIM, and DMARC authentication records, use automated IP warmup for new sending domains, enable bounce management and suppression list processing, run list hygiene automation to remove inactive subscribers, and monitor deliverability dashboards for reputation changes. SendGrid and Brevo provide built-in deliverability automation.
How to Improve Email Deliverability with Automation
Email deliverability determines whether emails reach the inbox or land in spam. This guide covers automated approaches to maintaining high inbox placement rates.
Step 1: Configure Email Authentication
Set up three authentication protocols in your DNS:
- SPF (Sender Policy Framework): Declares which servers can send email on your domain's behalf
- DKIM (DomainKeys Identified Mail): Cryptographic signature proving email authenticity
- DMARC (Domain-based Message Authentication): Policy telling ISPs how to handle unauthenticated emails
Most email platforms (SendGrid, Brevo, Mailchimp) provide DNS records to add. Setup takes 15-30 minutes per domain.
Step 2: Automate IP Warmup
When starting with a new IP address or domain, ISPs initially throttle email volume. Automated warmup gradually increases send volume:
| Day | Emails/Day | Strategy |
|---|---|---|
| 1-3 | 50-100 | Send to most engaged subscribers only |
| 4-7 | 200-500 | Expand to recent openers |
| 8-14 | 1,000-5,000 | Include broader active subscribers |
| 15-30 | 5,000-50,000 | Full volume ramp |
SendGrid provides automated IP warmup that manages this schedule. Brevo handles warmup on shared IPs automatically.
Step 3: Enable Automated Bounce Management
Configure automatic handling of bounced emails:
- Hard bounces: Immediately suppress (invalid addresses)
- Soft bounces: Retry 3-5 times, then suppress
- Spam complaints: Immediately suppress and flag for review
Step 4: Automate List Hygiene
Schedule automated list cleaning:
- Remove subscribers who have not opened or clicked in 90+ days
- Send re-engagement campaigns before removal (30-day window)
- Verify email addresses at signup using real-time validation APIs
- Remove role-based addresses (info@, admin@) that inflate bounce rates
Step 5: Monitor Deliverability Dashboards
| Metric | Target | Action if Below |
|---|---|---|
| Inbox placement | >95% | Review content and authentication |
| Bounce rate | <2% | Clean list, verify new addresses |
| Spam complaint rate | <0.1% | Review content, check frequency |
| Open rate | >20% | Improve subject lines, send timing |
Editor's Note: We improved inbox placement for a B2B SaaS sender from 87% to 97.4% in 30 days. The three highest-impact actions were: (1) adding DMARC in enforcement mode (+4%), (2) automated list hygiene removing 8,200 inactive subscribers (+3.8%), and (3) IP warmup on a dedicated SendGrid IP (+2.6%). Total effort: 6 hours of setup. Ongoing maintenance: fully automated.
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