Change email settings in Mail on iPad
In the Mail app , you can customize your email signature and mark addresses outside specific domains.
Customize your email signature
You can customize the email signature that appears automatically at the bottom of every email you send.
Go to Settings
> Mail, then tap Signature (below Composing).
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.
Mark addresses outside certain domains
When you’re addressing an email to a recipient who’s not in your organization’s domain, you can have the recipient’s name appear in red to alert you.
Go to Settings
> Mail > Mark Addresses (below Composing).
Enter the domains that are in your organization—ones that you don’t want marked in red.
You can enter multiple domains separated by commas (for example, “apple.com, example.org”).
The names of recipients in domains outside your organization appear in red, whether you send them an email or receive one from them.