Email security is no longer optional. With the rise of phishing, identity theft, and configuration flaws, securing your email delivery has become a cornerstone of deliverability. For businesses, every mistake can cost dearly in reputation, conversions, and revenue.
Summary- Why email security is a strategic issue
- Top 20 most common security mistakes
- How to fix them and secure your campaigns
- Recap table of mistakes and solutions
- In short: Top 20 email sender security mistakes
Why email security is a strategic issue
A bad email DNS setup, missing SPF or DKIM protocols, and your whole ecosystem suffers. Business email hacking is real, and every vulnerability can become a marketing email security breach.
Targeting, deliverability, and trust: security isn't just about blocking spam anymore — it's key to performance.
Top 20 most common security mistakes
- Missing SPF record
- Misconfigured DKIM key
- DMARC missing or set to "none"
- Undetected technical email marketing errors
- SMTP server without secure authentication
- Lack of DNS monitoring
- Using unsecured generic sender addresses
- Unsecured email configuration for subdomains
- Shared infrastructure with blacklisted IPs
- Missing SMTP "failover" mechanism
- Improper segmentation of transactional vs marketing flows
- Poor bounce management
- Degraded sender reputation
- Email spoofing not detected
- No active TLS encryption
- Missing DKIM key rotation policy
- Untested anti-spam filters
- Combined SPF DKIM DMARC errors
- Poor identifier alignment in headers
- Non-compliance with GDPR or consent policies
Mistakes: fix common GDPR and email-related errors too
How to fix them and secure your campaigns
For each identified mistake, there’s a targeted action to boost security and deliverability: strict DNS configuration, continuous monitoring, best practices and specialized tools.
Recap table of mistakes and solutions
| Mistake | Impact | Recommended Solution |
|---|---|---|
| Missing SPF | Email blocking by ISPs | Declare authorized IPs via an SPF record |
| Unaligned DKIM | Loss of trust in your sends | Generate and properly configure the DKIM key |
| DMARC set to "none" | No action taken against fraudulent emails | Switch to "quarantine" or "reject" mode |
| No TLS | Emails can be intercepted | Enable TLS encryption on the SMTP server |
| Shared IP infrastructure | Contamination from other senders | Switch to a dedicated or segmented IP |
No time to read it all? Here’s the recap
In short: Top 20 email sender security mistakes
- Missing SPF, DKIM or DMARC authentication is still one of the most common mistakes.
- Poor DNS configuration can expose your campaigns to spoofing or rejection.
- Email address spoofing weakens deliverability and sender reputation.
- Weak or reused passwords make professional email hacking easier.
- Ignoring DMARC reports prevents real-time vulnerability detection.
How can you avoid the main security mistakes when sending professional emails?
By properly configuring SPF, DKIM and DMARC, monitoring your sends, and avoiding common traps like broken links or unauthenticated domains, you’ll secure your emails and protect your sender reputation.
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