Question 1

What does the Outlook HTML Sanitizer do?

Accepted Answer

It auto-injects tiny margin and padding values (0.05pt) onto every table, td, and th in your email — a known workaround for Outlook's collapsing-margins and ghost-spacing bugs.

Question 2

When do I need to sanitize HTML for Outlook?

Accepted Answer

Whenever you see mysterious vertical gaps, collapsing rows, or inconsistent padding in Outlook for Windows.

Question 3

Will this break rendering in Gmail or Apple Mail?

Accepted Answer

No. 0.05pt is below the rendering threshold of modern clients, which round to zero and ignore it. Only Outlook reads and applies the styles.

Question 4

Can I change the spacing value?

Accepted Answer

Yes — the Spacing Value field defaults to 0.05pt. Smaller is safer for visual fidelity; larger if Outlook is being especially stubborn.

Question 5

Does it preserve my existing inline styles?

Accepted Answer

Yes. The sanitizer only adds margin/padding where you don't already have them.

Question 6

Is this safe to run before sending?

Accepted Answer

Yes. 100% client-side string transformation that leaves the structure of your HTML intact.

Fix Outlook's ghost spacing bugs in one click.

Fix Outlook's ghost spacing bugs in one click.