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If your cold outreach or marketing emails aren’t reaching inboxes, your campaigns are dead on arrival.
Email blacklisting can quietly destroy your sender reputation, lower your open rates, and put your entire domain at risk.
In this post, we’ll break down why blacklisting happens, and what steps to take to avoid it.
Outline:
Major email service providers (like Google, Outlook, and Yahoo) continue to raise the bar for domain reputation and email security.
Sending cold outreach or marketing emails from your primary domain can put your entire company's email deliverability at risk.
It’s strongly recommended that you use a platform that handles this protection for you.
If you choose to manage domain protection manually, here are the essential steps you must take:
Implement email authentication protocols like DKIM (DomainKeys Identified Mail), SPF (Sender Policy Framework), and DMARC (Domain-based Message Authentication, Reporting & Conformance).
These verify that your emails are legitimate and not being spoofed—key to protecting your domain reputation.
Start with low email volume and increase gradually over time. This "domain warming" builds trust with email service providers and helps avoid spam filters.
Regularly update and clean your email lists to avoid sending emails to invalid addresses. This can reduce bounce rates and spam reports, both of which can harm your domain reputation and deliverability.
Regularly monitor and analyze the deliverability rates, open rates, click-through rates, and bounce rates. These give insight into how inbox providers view your domain's trustworthiness.
Send emails that are relevant, personalized, and valuable to your recipients. Poor content can result in spam complaints—even from a clean list.
Stay away from tactics like:
Keep complaint rates low by only emailing targeted, interested recipients—and honoring unsubscribe requests promptly.
Sales and marketing emails should be sent from a dedicated IP (not the one used for internal or customer support emails).
If your sending address gets flagged or blacklisted, you need to switch to a new one and start the warm-up process all over again.
If your emails aren’t landing in inboxes, you’re not just losing replies—you’re losing revenue.
Deliverability is the backbone of a successful outreach strategy, and you should never send cold emails from your primary domain.
Resquared ensures your messages get seen—without risking your company’s email reputation.
🔥 Pre-Warmed & Monitored Email Infrastructure
We handle all the tech—SPF, DKIM, DMARC, IP warming, and rotation—so you don’t have to.
🔒Protect Your Main Domain
Avoid blacklists, spam folders, and sender reputation damage. Keep your company domain safe.
✅ Seamless Setup
Get started without needing IT. We create and manage domains and inboxes for you, and replies still go to your main email.
📬Live Reputation Monitoring
Track performance and health across all campaigns in real-time.
Get a demo and see why our reply rates are 2X higher than the industry benchmark.
To prevent blacklisting, avoid sending from your primary domain, warm up new domains gradually, use proper email authentication (SPF, DKIM, DMARC), and maintain clean, targeted lists.
Tools like Resquared handle all of this for you automatically.
If your domain or IP is blacklisted, you’ll need to pause email sends, identify the blacklist source, remove the domain or IP if possible, and switch to a new sending address.
Then, start the domain warming process from scratch. Resquared can manage this transition safely and quickly.
