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.
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Email Subject Line Optimizer Score email subject lines 0-100 with heuristics for length, spam triggers, emoji and personalization.
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Email-Safe CSS Inliner Inline simple <style> rules into style attributes so HTML email renders consistently across clients.
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HTML Email Signature Generator Generate a table-based, inline-styled HTML email signature from simple key=value fields.
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HTML to Plain Text Email Convert HTML email markup into a readable plain-text fallback.
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IMAP Mailbox Browser Connect to an IMAP mailbox — browse folders and read recent messages straight from your browser.
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List-Unsubscribe Header Builder (RFC 8058) Build List-Unsubscribe and one-click List-Unsubscribe-Post headers from a mailto and/or URL.
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POP3 Inbox Viewer Connect to a POP3 mailbox and read the most recent messages right in your browser.
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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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