Email subject line tester

The spam list is a habit check, not a verdict: real filters weigh the sender, the domain, authentication, and the whole message, so a flagged word is a reason to look twice, not proof of the junk folder. Merge tokens are excluded from visible length because the resolved value is what subscribers see; how many characters your merge field adds is unknowable here. Truncation points assume an average glyph width and emoji at about two slots, so treat the previews as close estimates rather than pixel truth.