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Custom HTML

Custom HTML is a block of HTML you write yourself. Drag it from Layout. Most emails do not need it. Use Heading, Text, and Button unless you need markup those blocks cannot make.

Custom HTML selected in the email layout

Custom HTML field and the Open editor button

HTML editor. Apply writes the markup back. Cancel closes it.

FieldWhat it changes
HTMLThe markup. It is required.
Open editorOpens a larger HTML editor. Apply writes it back. Cancel closes without applying.

HTML in email is easy to break in some inboxes. Prefer the other blocks when they can do the job.