Sign every email fur-free.

01 · GET THE IMAGE

On the Take Action section, choose a mark colour.
Download Signature · Light for white emails, or Signature · Dark if you use a dark theme. The badge alone also works.
Display it at about 240 × 60 px. Larger images can be flagged as spam.

Gmail and Thunderbird can also use the hosted image, so it never shows as an attachment: https://0fur.com/signature/0fur-signature-light.png

Gmail: Settings (gear) → See all settings → General → Signature → Create new. Click the image icon, choose “Web Address (URL)” and paste the address above, or upload the PNG. Set the size to “Small”, then click Save Changes at the bottom of the page.
Outlook (web / new): Settings → Accounts → Signatures → New signature. Insert the image with the image icon, resize it, then set it as default for new messages.
Outlook (classic Windows): File → Options → Mail → Signatures → New. Use the “Insert Picture” icon above the editor.
Apple Mail: Mail → Settings → Signatures → “+”. Drag the PNG into the signature box. Untick “Always match my default message font” to keep the formatting.
Thunderbird: Account Settings → tick “Use HTML” under Signature text, then paste the HTML copied with the “Copy HTML” button.
iPhone / Android: Mobile apps rarely support image signatures. Set it up on desktop (Gmail, Outlook web) and it will sync to your phone.

Every email you send now says it: it looks better without fur.