Email

Signatures, unsubscribe headers, CSS inlining and subject-line tools.

9 tools

Email Preheader Preview

Preview how an email subject and preheader may appear in mobile and desktop inboxes.

Email Subject Line Optimizer

Score email subject lines 0-100 with heuristics for length, spam triggers, emoji and personalization.

Email-Safe CSS Inliner

Inline simple <style> rules into style attributes so HTML email renders consistently across clients.

HTML Email Signature Generator

Generate a table-based, inline-styled HTML email signature from simple key=value fields.

HTML to Plain Text Email

Convert HTML email markup into a readable plain-text fallback.

IMAP Mailbox Browser

Connect to an IMAP mailbox — browse folders and read recent messages straight from your browser.

List-Unsubscribe Header Builder (RFC 8058)

Build List-Unsubscribe and one-click List-Unsubscribe-Post headers from a mailto and/or URL.

POP3 Inbox Viewer

Connect to a POP3 mailbox and read the most recent messages right in your browser.

SMTP Email Sender

Send a test email through any SMTP server — set host, port, TLS and credentials, then compose and send.

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