Fix Email Formatting Errors

A formal technical standard governs sender name/address structure. A few mistakes can get a message rejected as malformed.

What usually triggers this

Special characters in a display name (unescaped quotes/brackets/symbols). Improperly formatted sender addresses. Inconsistent sender details across sending methods.

How to fix it

1. Review each campaign's From Name/Email — remove special characters, keep names under ~64 characters.
2. Check templates for hardcoded sender info issues.
3. Run a suspect email through Mail-Tester before a full send.

A simple rule of thumb

Keep display names plain — letters, numbers, spaces, basic punctuation. Spell out titles/credentials plainly rather than wrapping in quotes or brackets.