Spammers in the guest posting industry are becoming smarter. 
They use multiple email accounts, multiple domains, and multiple fake identities to sell the same low-quality placements. Some even pretend to be different “writers,” “publishers,” or “agencies” — but all their emails come from the same IP address. 

GuestPostCRM solves this by using IP Detection, a powerful feature that identifies patterns across incoming emails and reveals when multiple senders are actually the same person. 



Let’s break down how it works and why this matters.


1. Extracting the IP of Every Incoming Email 


Every email that enters GuestPostCRM contains a hidden “Received From” header. 
This header includes: 

  • The sending server 
     
  • The real originating IP address 
     
  • Routing path 
     
  • Authenticated host information 
     

GuestPostCRM automatically reads this data and extracts the origin IP safely. 

Example: 

Received: from mail.sender.com (192.145.33.12) 

This IP is the sender’s real fingerprint — even if the sender tries to hide by using new emails or new names. 


2. Fetching All Emails From the Same IP


Once the IP is identified, the system performs the next critical step: 

✔ Fetch all emails from that IP across your entire inbox history. 

This helps you discover: 

  • Multiple accounts the sender is using 
     
  • Multiple deals they tried opening 
     
  • Multiple offers they sent pretending to be different people 
     
  • Their full behavior pattern 
     

If 5 different “writers” are emailing you… 
But all 5 come from the same IP… 

GuestPostCRM reveals the truth instantly. 


3. Why This Matters in Guest Posting 


Spammers in this industry often do the following: 

✔ Create 3–10 Gmail accounts 

(gp.seller01@gmail, linkteamseo@, placementshop22@, etc.) 

✔ Pretend to be different agencies 

They claim: 

  • “We are Team A” 
     
  • “We are Team B” 
     
  • “We are a new publisher” 
     
  • “We are a different seller” 
     

✔ Send offers for the exact same sites using different names 

This tricks buyers into thinking: 

  • It's a new opportunity 
     
  • It's a new vendor 
     
  • It’s a different deal 
     

But it's all the same person. 

✔ Try to negotiate twice 

Once as “Agency A” 
Once as “Agency B” 

✔ Try to bypass defaulter tracking 

If one account gets banned, they use another. 
But the IP stays the same. 

This is why IP Detection works seamlessly with features like Auto Payment Reminders for Link-building Agencies — together, they prevent fraudsters from escaping payment obligations by simply creating new email accounts. 

GuestPostCRM exposes them immediately.


4. Cracking Down on Multi-Account Spammers 


Once the CRM finds all emails from the same IP, it becomes extremely easy to identify: 

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  • Duplicate senders 
     
  • Multiple fake identities 
     
  • Repeated negotiation attempts 
     
  • Repeated spam 
     
  • Attempts to scam you using multiple “deals” 
     

Your system can instantly flag: 

“This sender is using multiple emails from the same IP — high spam probability.” 

This allows you to: 

  • Block them 
     
  • Mark them as defaulters 
     
  • Move their emails to Spammy-Content or Non-Relevance 
     
  • Stop wasting time 
     
  • Avoid getting tricked by fake agencies 
     

5. Validating This Behavior With Clear Logic 


GuestPostCRM doesn’t guess — it uses valid technical logic: 

  1. Get IP of current incoming email 
     
  1. Search CRM for all emails linked to this IP 
     
  1. Analyze patterns: 
     
  • Are they all promotional? 
     
  • Are they all from “different people”? 
     
  • Are they pushing the same deals? 
     
  • Are they creating multi-account spam? 
     
  1. Classify the sender appropriately 
     
  1. Log everything transparently 
     

This is not random — it’s clean, consistent, and technically correct. 

6. Why IP Detection Protects Your Business 


✔ Prevents duplicate deals 

No more negotiating twice with the same person using different emails. 

✔ Blocks scam patterns early 

If a seller is already a known defaulter, other emails from the same IP are automatically suspicious. 

✔ Improves spam accuracy 

Spammy multi-account behavior becomes very easy to detect once the IP is matched. 

✔ Saves time 

You don’t waste hours replying to the same person who pretends to be “Agency 1, Agency 2, Agency 3…” 

By automatically filtering out multi-account spammers, your team can focus on legitimate opportunities and avoid the costly problem of Missed Guest Post Email Replies from genuine publishers. 

✔ Makes the CRM smarter 

Over time, you build a database of behavior patterns linked to IPs. 


Final Summary


IP detection inside GuestPostCRM is a powerful anti-fraud tool. 

It works by: 

  1. Extracting the real IP from incoming emails 
     
  1. Fetching all emails previously sent from the same IP 
     
  1. Identifying multi-account spammers 
     
  1. Flagging suspicious behavior 
     
  1. Keeping your deal pipeline clean and trustworthy 
     

This helps you avoid manipulation, stay protected, and focus only on genuine guest post opportunities. 

If you'd like, I can write the next blog: 

“Defaulter System Explained: How We Stop Bad Clients Before Damage Happens” 
“How Duplicate Detection Prevents Double Negotiation & Time Waste” 
“The Psychology of Spammers in Guest Posting & How GPC Outsmarts Them”