When you’re running automated outreach—whether on LinkedIn, email, or both—a blacklist is one of the easiest ways to protect your reputation and improve your results.
If you’ve ever worried about messaging the wrong person, annoying someone who asked not to be contacted, or reaching out to a competitor by accident, this guide is for you.
What Is a Blacklist?
A blacklist is a list of people, companies, or email domains you never want your campaign to contact.
Once someone is added to your blacklist, Alsona automatically excludes them from all future outreach—no matter what campaign you run.
You can blacklist:
Specific email addresses
LinkedIn profiles URLs
Website / Domain (e.g. company.com)
Company Name
Individual Name
Job Title
Why a Blacklist Is Important
Using a blacklist is one of the simplest ways to keep your outreach clean, professional, and accurate.
1. Avoid awkward or embarrassing mistakes
The last thing you want is to accidentally pitch:
A current customer
A friend
A colleague
Someone who already said “no thanks.”
Someone you've already spoken with manually
A blacklist removes them from all campaigns automatically.
2. Protect your reputation
People are quick to call out unwanted messages.
A blacklist ensures you never:
Double-message someone
Contact someone who opted out
Reach the wrong audience
Mix warm conversations with cold outreach
It keeps your brand—and your personal profile—looking professional.
3. Improve your LinkedIn and email health
LinkedIn and email providers look at:
Spam complaints
Negative interactions
Bounce rates
Low-quality outreach behavior
Blacklisting risky or unqualified contacts helps maintain:
Higher acceptance rates
Better engagement
Stronger account safety
4. Stay compliant without thinking about it
A blacklist helps you follow all the major rules automatically:
CAN-SPAM
GDPR
Local privacy laws
Individual “stop contacting me” requests
Once someone is blacklisted, they’re suppressed forever unless you remove them.
5. Keep your outreach targeted
A blacklist helps filter out people who are:
Not a fit
Already contacted
Low-quality leads
Outside your ideal audience
This makes your message volume go toward the right people—and improves campaign performance.
What Should You Add to Your Blacklist?
Here are the most common items regular users add:
People who asked not to be contacted
If someone says “please remove me,” add them instantly.
People you already know personally
Friends, coworkers, advisors, etc.
Current clients
You don’t want automation sending them a sales pitch.
Past opportunities or sensitive conversations
People you’ve talked to manually should not also get cold outreach.
Competitors
Avoid giving them visibility into your strategy.
Low-quality domains
Such as:
“info@”
“support@”
“no-reply@”
Hard bounces
Emails that fail repeatedly.
How to Use a Blacklist (Simple Steps)
1. Upload a starter blacklist
Add any known contacts you never want messaged:
Friends
Colleagues
Competitors
Existing clients
2. Add anyone who replies negatively
Whenever someone says:
“Please remove me.”
“Stop contacting me.”
“Not interested.”
Put them on your blacklist to avoid future automated follow-ups.
3. Upload domains you want to avoid
Example:
@competitor.com
@yourcompany.com
4. Use Alsona’s auto-exclusion features
Alsona can automatically exclude:
People who replied
People in your inbox
People you tagged as DNC
Previously contacted leads
This keeps everything clean with less manual work.
5. Review your blacklist once per month
It only takes a minute—just make sure it’s up to date.
Tips for Getting the Most Out of a Blacklist
Err on the side of adding people.
If you're unsure, blacklist them.Keep it simple.
Add emails or URLs—no need for complicated rules.Don’t delete people from it.
Once someone is on your blacklist, they should stay there unless you manually change your relationship with them.Use it as a “safety net.”
It protects you from mistakes when launching new campaigns.
Final Thoughts
Using a blacklist isn’t just a safety feature—it’s one of the best ways to keep your outreach clean, respectful, and effective.
It takes only a few seconds to maintain but can prevent:
Embarrassing outreach
Negative reactions
Spam complaints
Damaged relationships
Wasted message volume
A strong blacklist is one of the easiest wins for anyone doing outreach.