Is Mailglass Lite really free?

Yes, Mailglass Lite is 100% free forever. There are no premium tiers, no hidden costs, and no feature limitations. You can preview, validate, and export HTML emails without any payment.

Do I need to create an account to use Mailglass Lite?

No account is required to use core features like HTML preview, validation, and PDF export. Optional sign-up unlocks additional features like cloud saves and sending test emails via your own email account.

How do I test my HTML email for Outlook compatibility?

Mailglass Lite includes 10 Outlook-specific validation rules that check for common issues like white lines, CSS background images, margin/padding problems, and missing MSO conditionals. Simply paste your HTML and click Validate to see all Outlook compatibility issues with one-click auto-fix options.

What is Gmail's 102KB email clipping and how do I avoid it?

Gmail clips (hides) emails larger than 102KB, showing a 'View entire message' link instead. Mailglass Lite displays your HTML size in real-time and warns you when approaching this limit. Use our Minify feature (⌘M) to compress your HTML and stay under the limit.

Can I test how my email looks in dark mode?

Yes, Mailglass Lite includes a dark mode preview toggle that simulates how email clients render your email in dark mode. It also validates for dark mode issues like pure black/white colors and transparent images that may cause problems.

Is my HTML code secure when using Mailglass Lite?

Yes, Mailglass Lite is privacy-first. Your HTML code is processed entirely in your browser and never sent to our servers. The app even works offline after the initial load.

How does the AI email generator work?

Our AI email generator uses GPT-5-mini to create professional HTML emails from text descriptions. You get 3 free AI credits on signup. Simply describe your email (e.g., 'Black Friday sale announcement with 50% discount') and the AI generates responsive, email-client compatible HTML with one of 12 professional layout archetypes.

What email clients does Mailglass Lite validate for?

Mailglass Lite validates your HTML against 43 rules covering Outlook 2007-2019, Outlook 365, Gmail (desktop and app), Apple Mail, iOS Mail, Yahoo Mail, Samsung Email, and more. Each rule identifies specific compatibility issues and offers auto-fix suggestions.

Can I send the created emails directly from Mailglass Lite?

Yes, you can send the created emails using your Google or Microsoft account via OAuth. No SMTP configuration needed. Simply sign in, enter recipient addresses (or import from CSV), and send test emails to check rendering in actual email clients.

How do I make my HTML email accessible?

Mailglass Lite includes accessibility validation rules that check for missing alt text on images, proper table roles, minimum font sizes, and meaningful link text. Our auto-fix feature can add these accessibility improvements with one click.

AI Email Generation: Tips for Better Results in 2026

AI email generation has transformed how marketers create emails. But getting good results requires knowing how to prompt AI effectively. Here's how to get the most out of AI email tools in 2026.

How AI Email Generation Works

AI email generators like Mailglass Lite use large language models to create HTML email code based on your prompts. The quality of your output depends heavily on your input.

The Art of Prompting

Be Specific

<!-- Too vague -->
"Create a marketing email"

<!-- Good -->
"Create a product launch email for a new iPhone case called 'ArmorGlass'. 
Include a hero image placeholder, 3 product features, customer testimonial, 
and a 'Shop Now' CTA button. Use purple (#7C3AED) as the primary color."

Include Context

Tell the AI about your:

Brand: "We're a luxury skincare brand targeting women 25-45"
Tone: "Professional but friendly, use light humor"
Goal: "Drive traffic to our summer sale page"
Constraints: "Email should work in Outlook, keep under 102KB"

Specify Structure

"Create an email with:
1. Logo header
2. Hero section with headline and subheadline
3. Three-column feature grid
4. Testimonial quote
5. CTA button
6. Footer with social links and unsubscribe"

Prompt Templates That Work

Product Launch

"Create a product launch email for [PRODUCT NAME]. 
Target audience: [AUDIENCE]
Brand tone: [TONE]
Primary color: [HEX]

Include:
- Eye-catching headline
- Product image placeholder
- 3 key features with icons
- Launch date and pricing
- Early bird discount (if applicable)
- Primary CTA: [BUTTON TEXT]

Style: Modern, clean, mobile-responsive"

"Create a weekly newsletter template with:
- Header with logo and date
- Featured article section with image
- 3 article previews in a grid
- Quick tips section
- Upcoming events list
- Social media links
- Footer with preferences and unsubscribe

Brand: [BRAND NAME]
Industry: [INDUSTRY]
Color scheme: [COLORS]"

Promotional

"Create a promotional email for a [PERCENT]% off sale.
Sale name: [NAME]
Duration: [DATES]
What's on sale: [ITEMS]

Include:
- Bold headline with discount
- Countdown urgency element
- Featured products (3-4)
- Promo code display
- Shop now CTA
- Terms and conditions footer

Style: Exciting but not spammy"

Iterative Refinement

Don't expect perfection on the first try. Refine your results:

Generate first version - Get the basic structure
Review and identify issues - What's missing or wrong?
Refine with specific requests - "Make the headline bigger", "Add more padding to the CTA button"
Test and iterate - Preview in Mailglass Lite, fix issues

Follow-up Prompts

"Good, but please:
- Make the hero section taller
- Add more contrast to the button
- Include a preheader text
- Add alt text to all images"

Common AI Email Mistakes

1. Using Non-Email-Safe CSS

AI might generate CSS that doesn't work in email. Watch for:

Flexbox (limited support)
CSS Grid (not supported)
External stylesheets (often blocked)
Web fonts without fallbacks

Solution: Run generated code through Mailglass Lite validation.

2. Missing Outlook Compatibility

AI often forgets MSO conditionals for Outlook:

<!--[if mso]>
<table>...</table>
<![endif]-->

Solution: Add "Make this compatible with Outlook" to your prompt.

3. Forgetting Mobile

Default AI output might not be responsive.

Solution: Include "mobile-responsive" or "responsive design" in every prompt.

Using AI with Mailglass Lite

Mailglass Lite's AI assistant is trained specifically for HTML email. It:

Generates email-safe HTML/CSS
Includes Outlook compatibility code
Creates responsive layouts by default
Adds accessibility attributes (alt text, roles)
Outputs clean, validated code

Example Prompt in Mailglass Lite

"Create a welcome email for new subscribers to a SaaS product called 'TaskFlow'.
The email should:
- Welcome them by name (use {{first_name}} merge tag)
- Highlight 3 key features
- Include a 'Get Started' button
- Offer help resources
- Have a professional but friendly tone
- Use blue (#2563EB) as the primary color"

Quality Checklist for AI-Generated Emails

After AI generates your email:

☐ Run through Mailglass Lite validation
☐ Check Outlook preview
☐ Verify mobile responsiveness
☐ Confirm all images have alt text
☐ Test all links
☐ Review for brand consistency
☐ Check text-to-image ratio
☐ Verify preheader text is set

The Human Touch

AI is a tool, not a replacement. Always:

Review for accuracy - AI can make things up
Add your voice - Personalize the copy
Check brand alignment - Ensure it matches your style guide
Test before sending - Validate in real email clients

Key Takeaways

Be specific in your prompts - include structure, tone, and constraints
Use iterative refinement - first draft + targeted feedback
Always validate AI output - check for email-safe code
Include "responsive" and "Outlook compatible" in prompts
Keep the human touch - review, personalize, test

Ready to try AI-powered email generation? Mailglass Lite includes an AI assistant trained specifically for HTML email development.