In the world of cold email outreach, deliverability is crucial. Your emails need to land in the inbox, not the spam folder. This article outlines 10 content triggers that impact cold email deliverability and provides actionable advice for staying out of spam.
1. ALL CAPS AND EXCESSIVE PUNCTUATION
Using all caps or excessive punctuation ("!!!" or "???") in your subject lines or email body can trigger spam filters. Keep your subject lines polite and inviting.
Actionable Tip:
Subject: Excited to share our new collaboration opportunity
2. IMAGE-ONLY EMAILS
Spam filters can't read images, so image-only emails can appear suspicious. Use a balance of text and images to ensure deliverability.
Actionable Tip:
Include a brief introduction and a call-to-action (CTA) in your email copy, and accompany it with an image that supports your message.
3. MISLEADING SUBJECT LINES
Don't use misleading or unrelated subject lines to bait recipients into opening your emails. Be honest and straightforward.
Actionable Tip:
Subject: Invitation to collaborate on our latest project
4. USING SPAMMY WORDS
Words like "free," "click here," or "buy now" can raise spam flags. Avoid using them in your email body and subject line.
Actionable Tip:
Frame your CTAs differently: "Visit our website to learn more" or "Explore the benefits of our collaboration".
5. SENDING FROM A NEW DOMAIN
Most ESPs flag accounts that send over 50 cold emails daily from a new domain. Warm up your email address gradually, following a specific cadence.
Actionable Tip:
Follow FiresideSender's recommended warmup schedule: https://firesidesender.com/guides/email-warmup
6. POORLY FORMED HTML
Incorrect HTML code, broken links, or missing alt attributes can harm your email's deliverability. Ensure your HTML is clean and well-formed.
Actionable Tip:
Validate your HTML code with tools like https://validator.w3.org/ or https://www.freeformatter.com/html-validator.html
7. INCLUDE AN OPT-OUT LINK
Providing a simple and clear opt-out option benefits your deliverability. It complies with regulations and shows respect for recipients' preferences.
Actionable Tip:
Offer an opt-out link in the email footer and make it easy to unsubscribe.
8. SENDING FROM A NON-DEDICATED IP
Sharing an IP address with spammers negatively affects your deliverability. When possible, use a dedicated IP address.
Actionable Tip:
Choose an Email Service Provider (ESP) that provides the option of using a dedicated IP address for sending emails.
9. IGNORING FEEDBACK LOOPS
Feedback loops provide valuable insight into spam complaints. Monitor and address any complaints to improve your sender reputation.
Actionable Tip:
Set up feedback loops with your ESP and review complaints regularly. Address any issues and adjust your content or targeting strategy.
10. NEGLECTING BLACKLISTS
Blacklists can affect your sender reputation and deliverability. Regularly check blacklists to ensure your domain is not listed.
Actionable Tip:
Monitor blacklists using tools like MXToolbox (
By addressing these content triggers and optimizing your spam score, you can improve your cold email deliverability and maximize the potential of your outreach.