Custom Email Signature iPhone 13 Pro Max

Hi jimwingler,

Thanks for contacting Apple Support Communities!

We understand that you're unable to add images or logos to your email signature on your iPhone.

The iOS doesn't include a feature which would allow you to add images or logos to your email signature. It only allows for text. You can learn more here: Change email settings in Mail on iPhone - Apple Support

Customize your email signature

You can customize the email signature that appears automatically at the bottom of every email you send.

1. Go to Settings  > Mail, then tap Signature (below Composing).

2. Tap the text field, then edit your signature.

You can only use text in your Mail signatures.

Tip: If you have more than one email account, tap Per Account to set a different signature for each account.

Feel free to share any feature requests with Apple directly here: Product Feedback - Apple

Take care!