Email Integration
ClackyAI’s default system email templates have been comprehensively optimized according to industry standards, including subject line structure, body content ratio, HTML formatting, and link specifications. This ensures that platform-generated notification emails maintain high delivery success rates.
When composing custom email content, inbox placement can be influenced by content characteristics and recipient behavior. Therefore, it’s important to understand the following principles.
🔍 Why Emails Are Classified as Spam (Essential Principles)
Major email service providers (Gmail, Outlook, QQ, etc.) use automated models to determine whether an email “looks like spam.”
These models primarily rely on the following signal categories:
1. Content Feature Signals
Filtering systems analyze subject lines, body content, links, and formatting structure.
- Subject lines that resemble advertisements are more likely to be deprioritized
- Less text and more images appear more like marketing emails
- Multiple redirects or unclear link sources are viewed as potential security risks
- Complex HTML structures resemble mass-sent commercial advertising templates
Inference Logic:
The vast majority of spam emails share these characteristics. Filters therefore make “probabilistic judgments” — even legitimate content may be incorrectly flagged.
2. User Engagement Signals
Recipient behavior directly impacts future email delivery quality.
Positive behaviors: Opening, reading, replying, moving to inbox
Negative behaviors: Quick deletion, prolonged inactivity, marking as spam
Inference Logic:
Email systems reason: “If users don’t like these types of emails, we should filter them more strictly in the future.”
3. Content Consistency Signals
If your email content structure, tone, or proportions change significantly, they may be re-evaluated.
Inference Logic:
Systems treat “inconsistency” and “unusual formatting” as potential risk indicators.
📩 Brief Recommendations for Custom Emails in ClackyAI
The following practices can significantly reduce the probability of filtering:
1. Natural, Non-Promotional Subject Lines
Filters are most sensitive to promotional language.
Recommended: Use descriptive subject lines rather than promotional ones.
2. Text Content Over Image Content
Ensure the main message is conveyed through text, allowing filters to recognize the email as “normal communication.”
3. Keep Links Concise
Avoid shortened URLs or multi-redirect links to reduce phishing suspicion scores.
4. Simple, Clean Layout
Overly complex HTML structures easily trigger marketing filter rules.
5. Increase Recipient Engagement
Encourage users to open, read, reply, or mark emails as “not spam.” These positive behaviors improve overall sender reputation.
📌 Summary
ClackyAI has optimized default templates to ensure system emails perform well across most email providers.
When composing custom email content, filtering systems evaluate based on “content characteristics + user behavior” models to determine email trustworthiness. Therefore, maintaining natural, clear, and well-structured email content is the core approach to avoiding spam folders.
Best Practices Checklist
When creating custom emails in ClackyAI, consider these guidelines:
✅ Subject Line
- Keep it concise and descriptive
- Avoid excessive punctuation (!!!, ???)
- Avoid all caps or excessive emojis
- Be specific about the email’s purpose
✅ Body Content
- Use plain, professional language
- Maintain a good text-to-image ratio (more text, fewer images)
- Include clear, relevant information
- Avoid spam trigger words (free, urgent, act now, limited time, etc.)
✅ Links and CTAs
- Use full, recognizable URLs when possible
- Limit the number of links in a single email
- Ensure all links are functional and relevant
- Avoid suspicious or obfuscated URLs
✅ HTML and Formatting
- Keep HTML structure simple and clean
- Test emails across different email clients
- Avoid excessive styling or JavaScript
- Ensure mobile responsiveness
✅ Sender Information
- Use a recognizable “from” name
- Maintain consistent sender identity
- Include a valid reply-to address
- Provide clear unsubscribe options (when applicable)
Frequently Asked Questions
Why did my email go to spam even though I followed the guidelines?
Email filtering is probabilistic and influenced by many factors, including recipient history, domain reputation, and provider-specific algorithms. Following best practices improves your chances but doesn’t guarantee inbox placement.
How can I test my email deliverability?
Send test emails to multiple email providers (Gmail, Outlook, Yahoo, etc.) and check their placement. You can also use email testing tools to preview how your email appears across different clients.
What should I do if recipients report my emails as spam?
Review your content for potential trigger words or formatting issues. Ensure you’re only sending to engaged recipients who have opted in to receive your communications. Consider simplifying your email design.
Can I use my own SMTP server with ClackyAI?
Yes! You can ask Clacky to implement custom SMTP server integration for your project. Simply describe your requirements in a new development iteration, and Clacky will help you set up the necessary code and configure the environment variables for your SMTP server connection.