⚡ Email Signature Builder

📧 Gmail

1. Open Gmail → click the gear icon ⚙ → See all settings
2. Scroll to Signature → click Create new → name it
3. Click the </> source code icon in the signature editor toolbar
4. Paste your HTML code → click OK → Save Changes

💼 Microsoft Outlook

1. Go to File → Options → Mail → Signatures
2. Click New and name your signature
3. Save the HTML as a .htm file; import via the Outlook signature editor
4. Or paste directly using Outlook's Insert → Signature → Edit Signatures

🍎 Apple Mail

1. Go to Mail → Preferences → Signatures
2. Click + and name the signature; uncheck "Always match default font"
3. Quit Mail; find your signature file in ~/Library/Mail/.../Signatures/
4. Replace its contents with your HTML code; relaunch Mail

📬 Yahoo Mail

1. Go to Settings (gear) → More Settings → Writing email
2. Toggle on Signature and paste your HTML in the editor
3. Click Save