How to Improve Email Deliverability in MailerLite: A Practical Checklist
5 min read
Affiliate disclosure: This article contains an affiliate link. If you sign up through it, Discovereviews may earn a commission at no extra cost to you. The checklist uses MailerLite’s public help guidance and does not promise a specific delivery rate.
If a campaign appears as sent in MailerLite, that does not prove it reached the inbox. Email deliverability is shaped by several systems: the sender’s domain reputation, authentication, list quality, recipient engagement, message content, and decisions made by each mailbox provider. A platform can provide useful tools, but no setting guarantees inbox placement.
For MailerLite users, the practical starting point is to make the sender identity verifiable, keep the list permission-based, and send messages that match what subscribers expected. This checklist explains the steps in that order and what to check when results weaken.
Start with a quick deliverability checklist
- Send from a domain you control and authenticate it inside MailerLite.
- Use a recognizable sender name and a working reply-to address.
- Collect subscribers through clear, permission-based signup forms.
- Do not import purchased, scraped, or poorly documented email lists.
- Send at a cadence subscribers can reasonably expect.
- Remove or suppress invalid, bounced, and persistently inactive addresses.
- Review clicks, replies, bounces, unsubscribes, and spam complaints after each campaign.
1. Authenticate a domain you control
Domain authentication helps mailbox providers verify that MailerLite is authorized to send using your domain. MailerLite’s setup guidance can involve DKIM, SPF, and domain-verification DNS records. The exact records are account-specific, so copy the values shown for your own sending domain and add them at the DNS host that manages it.
After adding records, return to MailerLite and run its DNS check. A common mistake is changing punctuation, adding a duplicate SPF record, or placing a DNS value in the wrong field. If a record remains unverified, compare the name and value character for character and check whether DNS has finished propagating. Do not guess replacement values.
If you also configure DMARC, follow guidance from your domain provider and mailbox services. DMARC settings should match your organization’s sending setup; a restrictive policy applied without reviewing all legitimate senders can disrupt mail from other services using the domain.
2. Make the sender identity recognizable
Use a sender name subscribers will recognize from the signup page, and send from an address on your authenticated domain. A brand name that changes from campaign to campaign can confuse readers and increase the chance they ignore or report a message. Keep the reply address monitored so genuine replies do not disappear.
3. Build a list from permission, not volume
A list is not healthy simply because it is large. People should know who is collecting their address, what type of email they will receive, and how often they can expect it. Use signup language that is clear, retain records of how contacts joined, and respect unsubscribe requests promptly.
Avoid purchased, scraped, or borrowed lists. MailerLite’s deliverability guidance warns against bought contacts, and people on such lists have not necessarily agreed to hear from your business. A sudden burst of messages to disengaged contacts can damage sender reputation and create complaints.
4. Keep the sending pattern steady
If you have a new domain or have not sent recently, begin with the most engaged subscribers and a manageable cadence. Do not move from months of silence to a high-volume blast. Increase only when the list responds well and your sending infrastructure is ready. There is no universal schedule that suits every audience; consistency and relevance matter more than a rigid calendar.
5. Write for the subscriber, then check technical details
Use a subject line that accurately describes the email and make the main action easy to understand. Check that links lead to the expected pages, the sender information is correct, and images have useful alternative text. A message does not become deliverable because it uses fewer images or avoids a particular word; focus on accuracy, a useful message, and a clean sending setup.
Before a large campaign, send a test to accounts across the mailbox providers important to your audience. Check mobile rendering, links, the plain-text version, and the from address. MailerLite’s own tools may flag technical or content issues, but the final test should reflect the devices and inboxes your readers actually use.
6. Review the signals that point to a problem
Look at bounces, unsubscribes, complaints, clicks, and replies together. A high open rate is not a complete picture because privacy protections can affect open tracking. If a campaign’s engagement changes sharply, investigate the list source, message relevance, frequency, and authentication before sending more volume.
Remove invalid addresses and suppress contacts who repeatedly do not engage when appropriate. For a long-inactive group, send a clear re-engagement message only if you have a valid basis to contact them, then stop emailing people who do not respond. Do not keep retrying addresses that hard-bounce.
7. Diagnose issues in a sensible order
- Check MailerLite’s domain-authentication status and verify DNS records at your host.
- Confirm the sender and reply-to addresses use the intended domain.
- Review recent imports and remove contacts with unclear permission or poor provenance.
- Compare sending volume and cadence with prior campaigns.
- Check links, redirects, attachments, and the campaign’s plain-text version.
- Review bounces, complaints, unsubscribes, and clicks by campaign and recipient group.
- Contact MailerLite support with the campaign date, sending domain, and relevant error details if the cause remains unclear.
What MailerLite can and cannot control
MailerLite provides domain setup instructions, sending tools, suppression controls, campaign reporting, and deliverability guidance. It cannot decide how Gmail, Yahoo, Outlook, or another recipient provider classifies a message. It also cannot make an uninterested or non-consenting audience engaged. The strongest results come from combining correct authentication with permission, relevant content, and a sending pattern readers recognize.
For a broader overview of MailerLite’s features and plan fit, see our MailerLite review and pricing guide. If you are building a welcome sequence, our funnel guide shows how a form, automation, and follow-up messages can work together.
If you want to assess MailerLite’s forms, campaigns, and domain setup workflow, explore MailerLite.
Frequently asked questions
Does MailerLite guarantee that emails reach the inbox?
No email service can guarantee inbox placement. Mailbox providers apply their own filtering, and sender authentication, reputation, list quality, content, and recipient behavior all matter.
Which DNS records does MailerLite use for authentication?
MailerLite’s help materials describe DKIM, SPF, and domain-verification records. Use the exact values generated for your account and follow the current instructions in its domain settings.
Will domain authentication alone fix spam placement?
Authentication is an important part of identifying your sender, but it does not repair a purchased list, irrelevant campaigns, excessive volume, or poor engagement by itself.
Should I remove subscribers who do not open?
Do not use opens as the only measure because privacy protections can distort open data. Consider clicks, replies, purchases, signup source, and length of inactivity before deciding how to re-engage or suppress a group.
