Lemlist Deliverability Tips: How to Keep Your Sender Reputation High

Setting up a powerful cold email campaign requires more than just persuasive copy and a list of prospects. The biggest challenge for modern B2B sales teams and marketers isn’t writing the email itself—it is ensuring that the email actually reaches the recipient’s main inbox. Major email providers like Google and Microsoft have drastically tightened their spam filters. If your sender reputation drops, your carefully crafted emails will vanish directly into the ‘Unwanted’ or ‘Spam’ folders.

Lemlist is one of the most powerful tools on the market to prevent this, provided you configure the software correctly. In this comprehensive guide, we share advanced deliverability tips and tactics to keep your sender reputation at an absolute maximum and structurally bypass spam filters.

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1. The Technical Foundation: SPF, DKIM, DMARC, and Custom Tracking Domains

Before you send a single campaign through Lemlist, your technical infrastructure must be 100% airtight. Email providers check within milliseconds whether an incoming mail is legitimate using three mandatory DNS records:

• SPF (Sender Policy Framework): This record specifies which servers are authorized to send emails on behalf of your domain.
• DKIM (DomainKeys Identified Mail): This adds a digital signature to your emails, proving that the content has not been altered in transit.
• DMARC (Domain-based Message Authentication): This tells receiving servers what to do if an email fails SPF or DKIM checks (set this to p=quarantine or p=reject after a stable testing phase).

Additionally, Lemlist uses a shared tracking domain by default to measure opens and clicks. Because you share this domain with other users, their poor sending habits can damage your deliverability. Therefore, always set up a Custom Tracking Domain (CTD) within your Lemlist settings. This ensures all tracking links run through your own clean subdomain.

2. The Importance of Automated Email Warm-up (Lemwarm)

If you register a new email domain and immediately start sending hundreds of cold emails a day, spam alarms will instantly go off at Google and Outlook. A domain needs to be warmed up gradually to build a positive sending history.

Lemlist features a built-in, automated warm-up tool called Lemwarm. Lemwarm ensures that your email address automatically interacts with a network of thousands of reliable inboxes. The tool sends emails, removes them from spam folders if they land there accidentally, marks them as important, and replies to them. This mimics natural human behavior and gives your sender reputation a massive boost.

3. Volume Limits and Smart Sending Schedules

A common mistake is pushing out a massive batch of emails all at once. This creates a clear pattern typical of spammers. In Lemlist, you can set precise sending schedules.

Ensure your emails are spread out throughout the day, preferably during your target audience’s working hours. Limit the maximum volume per email address to 30 to 50 cold emails per day. If you need more capacity, utilize Lemlist’s Inbox Rotation feature to smoothly distribute your sending volume across multiple accounts and domains.

4. List Hygiene and Bounce Prevention

If your emails are repeatedly sent to email addresses that no longer exist, it results in a hard bounce. A hard bounce rate above 2% is extremely damaging to your domain reputation. Make it a strict habit to thoroughly validate your prospect list using tools like Debounce or NeverBounce before uploading them to Lemlist. Furthermore, Lemlist has built-in filters to immediately block known invalid email syntaxes.

Deliverability Best Practices Matrix

Conclusion: Protect Your Reach, Maximize Your ROI

Deliverability is not a one-time task, but an ongoing process. By correctly configuring your SPF/DKIM/DMARC records, using a Custom Tracking Domain, keeping Lemwarm consistently active, and strictly monitoring your sending volumes, you ensure your cold outreach campaigns achieve the highest possible return on investment.

🚀 Ready to stop landing in the spam folder and double your open rates? Start automating your outreach the smart way today. Click here to instantly activate your 14-day free trial on Lemlist with no credit card required.

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