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Email Blocked Due to Content:

Why It Happens (and How to Fix It)

Catherine avatar
Written by Catherine
Updated over 3 weeks ago

Some customers may experience missing, delayed, or blocked emails related to pest control or weed management services.

This issue is not provider-specific. It can occur across major email platforms due to how automated content filtering works — especially when emails include industry-standard terminology related to treatment and application.

This article explains why emails are blocked due to content, the common red-flag words, and the recommended wording changes that help prevent this issue.

Common Red-Flag Words

The following terms are legitimate but may increase blocking risk when combined or repeated.

Pest Control–Related Terms

  • crack and crevice

  • crack & crevice application

  • injection

  • penetration

  • bait placement

  • chemical treatment

Weed & Lawn Care–Related Terms

  • weed control

  • herbicide

  • chemical application

  • spraying / sprayed

  • kill / killing

Context Amplifiers

  • application

  • treatment

  • control

  • chemical

  • repeated technical descriptions

Recommended Word Changes (Email & Customer PDFs)

Using neutral wording in emails and emailed PDFs significantly reduces blocking risk.

Pest Control

Original Term

Recommended Alternative

Crack and crevice

Targeted structural areas

Crack & crevice treatment

Precision interior treatment

Crack & crevice application

Localized structural treatment

Chemical treatment

Professional treatment service

Bait placement

Targeted monitoring and control


Weed Control

Original Term

Recommended Alternative

Weed control

Vegetation management

Herbicide application

Selective vegetation treatment

Chemical weed treatment

Landscape treatment service

Weed spraying

Targeted landscape treatment

Kill weeds

Growth control service

Change the wording (best immediate fix)

This is honestly the most reliable solution.

Instead of:

crack and crevice application

Use:

  • “void and gap treatment”

  • “harborage-area treatment”

  • “targeted surface treatment in confined areas”

  • “precision treatment in structural gaps”

  • “treatment in narrow structural spaces”

💡 Pro tip: even changing it once isn’t enough — remove it everywhere (subject, body, footer, attachments).

Instead of:

Weed control / herbicide application

Use:

  • Vegetation management service

  • Targeted vegetation treatment

  • Landscape treatment service

  • Growth control service

  • Selective plant management

These are widely used by large operators specifically to avoid spam filters.

Subject line examples (this matters a LOT)

❌ Bad:

Weed Control & Crack and Crevice Treatment Completed

✅ Good:

Property Treatment Completed
Scheduled Service Completed
Landscape & Interior Service Update

Then explain briefly and generically in the body.

Why Emails Are Blocked Due to Content

Modern email providers use automated filtering systems that scan:

  • Subject lines

  • Email body text

  • PDF attachments

  • Inline previews

These systems rely on machine learning and pattern recognition. They do not evaluate industry context or regulatory intent.

As a result, certain legitimate service-related terms may be incorrectly classified as unsafe or inappropriate — particularly in automated or bulk emails.

This behavior affects:

  • Gmail

  • Outlook / Microsoft 365

  • Yahoo Mail

  • Apple Mail (iCloud)

  • Corporate email security systems

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