From the Home screen tap Settings > Mail, Contacts, Calendars > Scroll down to Mail and tap Signature.
Select “All Accounts” or “Per Account” to designate which mail account to apply the signature.
Delete the existing signature then type or past your signature in the text field.
- To paste the text copied in the iPhone or iPad’s clipboard tap and hold on the text box then select paste.
- Tap Mail in the top left corner of the screen to save the changes automatically.
Confirm the message is applied correctly by sending yourself an email from your iPhone.
Be careful adding images to the signature. The functionality is available, however it is very limited as there is a size limit of 8kb!
If you try adding a larger image (around 1 MB) and the image will be replaced with a small box icon when composing a new message from within the Mail app as pictured below.