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Check subject length without claiming deliverability.

Build and preview a mailto link with recipients, subject and body.

Preview a signature and copy it into your mail settings.

Generate sample email addresses from random names or a TXT username list.

Extract email addresses from text or HTML and group by size or domain.

Check syntax, duplicates and common domain spelling mistakes in email lists.

Inspect routing, authentication results and visible privacy details from raw email headers.

Explain common SMTP and enhanced delivery status codes in bounce messages.

Review subject length, links, image descriptions and common promotional wording.

Query MX, SPF, DKIM and DMARC; draft SPF and DMARC records.

Mask email addresses and inspect URL structure without opening links.

Merge lists, calculate intersections and differences, and export domain statistics.

Extract unique addresses from pasted content or local TXT, CSV, HTML and EML files.

Create an HTML email and a plain-text version from editable message fields.

Preview HTML email, inline static CSS at a selected width and inspect compatibility risks.