To improve email deliverability, authenticate your domain with SPF, DKIM and DMARC, remove invalid and unengaged addresses, send only to people who asked for your mail, and keep volume steady. Reputation is built from those four habits, and the order below puts the fastest wins first.
Which fixes come first?
- Authenticate the domain. Publish SPF and DKIM, then a DMARC record starting at p=none. Walkthrough: SPF, DKIM and DMARC explained.
- Meet the Gmail and Yahoo rules. One-click unsubscribe, a low complaint rate and valid DNS are now requirements for bulk senders. See the requirements.
- Send from a domain you own. Do not send marketing from a free Gmail or Yahoo address.
- Clean the list. Remove hard bounces at once and suppress long-inactive contacts. Details in list hygiene.
- Use confirmed opt-in where you can. It keeps typos and fake signups out.
What comes after the basics?
- Warm up new domains and IPs. Raise volume gradually instead of blasting the full list on day one. See email warm-up.
- Segment by engagement. Mail your most active contacts first and treat the rest more carefully.
- Make unsubscribing easy. A visible link and the one-click header cost you less than a spam complaint. See one-click unsubscribe.
- Clean up content. Match the subject line to the message, keep the HTML light, use your own domain for links and give text-only readers a plain-text part.
- Monitor continuously. Watch Postmaster Tools, bounce rates and blocklists so you catch a drop in the first week, not the third month.
What should you not do?
- Buy, rent or scrape email lists. They contain spam traps and uninterested people.
- Change sending domain every time results dip. It resets nothing and looks evasive.
- Send a huge one-off campaign to a list that has been quiet for a year.
- Ignore replies. Mail that gets replies is a strong positive signal.
How do you know the fixes worked?
Compare before and after on the same metrics: complaint rate, bounce rate, authentication pass rate, and placement in a repeat deliverability test. Improvement in reputation is gradual, so give each change a few sends before judging it.
For a fuller routine you can keep, read email deliverability best practices. If the numbers still do not move, a consultant can audit what you cannot see from the inside.
Frequently asked questions
What is the fastest way to improve deliverability?
Fix authentication and stop sending to bad addresses. Those two changes remove the most common causes of spam placement and take little time.
Does a double opt-in help deliverability?
Yes. It confirms the address is real and the owner wants your mail, which lowers bounces, spam traps and complaints.
Should I remove inactive subscribers?
Usually yes, after a re-engagement attempt. Continuing to mail people who never open signals low interest and risks spam-trap hits.
How many emails should I send per day?
There is no fixed figure. Your platform's limits, your reputation and the age of the domain decide it. Increase gradually and watch complaints and bounces.