On an iPhone, email settings are primarily accessed through the Settings app. Here is how you can find and adjust your email settings:

• Open the Settings app on your iPhone.
• Scroll down and tap Mail (or Mail, Contacts, Calendars on some versions).
• From here, you can:
  • Tap Accounts to see all your email accounts.
  • Select a specific email account to view or edit its settings such as incoming and outgoing mail server details.
  • Add or remove email accounts by tapping Add Account or selecting an account and choosing Delete Account.
  • Customize Mail app preferences like notifications, message list appearance, composing options, and threading under the main Mail settings.
  • Adjust sync frequency by selecting Fetch New Data and choosing push or fetch intervals.
  • Change your email signature by tapping Signature within Mail settings

For example, to change server settings for an email account:

• Go to Settings > Mail > Accounts.
• Tap the desired account.
• Tap the account email address again to access detailed settings.
• Modify incoming/outgoing server settings as needed

This centralized location in the Settings app allows you to manage all aspects of your email accounts and Mail app behavior on your iPhone.