Free skill · October 30, 2026

Email Subject Line Length Check

Check campaign subject lines against the recorded character limit.

Check campaign subject lines against the recorded character limit. Preparation only, not an account action.

Download the free skill

One complete Markdown file. No subscription or fabricated setup files.

Download SKILL.md

What to provide

The subject lines in the campaign batch and the character count for each.

How it works

  1. Count the subject lines in the batch.
  2. Count those within the recorded character limit.
  3. Recompute the within-limit share.
  4. Return the check without editing any line.

The output

batch | lines | within_limit | over_limit | within_pct | verdict

Worked fictional example

Fictional batch had 25 subject lines and 18 were within the 60-character review limit: 72% within limit with 7 flagged.

Checks and limits

Keep original values, source IDs and version dates. Unknown facts stay held. Use qualified review for hiring, legal and accounting conclusions. No send, share, sign-in, scheduling, ledger change or payment. Fictional contract review is not a live account compatibility test.

More marketing workflows · How-to guides

Method: reviewed source. Demand lead: Documented marketing workflow need from the reviewed source; not measured exact intent. Site impressions are not monthly volumes; exact topic volume is unmeasured. Checked October 30, 2026.