Check your email in Mail on iPhone
In the Mail app , you can read emails, add contacts, and preview some of the contents of an email without opening it.

Read an email
In the inbox, tap the email you want to read.
Preview an email and a list of options
If you want to see what an email is about but not open it completely, you can preview it. In the inbox, touch and hold an email to preview its contents and see a list of options for replying, filing it, and more. See Perform quick actions on iPhone.
Show a longer preview for every email
In your inbox, Mail displays two lines of text for each email by default. You can choose to see more lines of text without opening the email.
Go to Settings > Mail > Preview, then choose up to five lines.
Show the whole conversation
Go to Settings > Mail, then turn on Organize by Thread (below Threading).
Tip: You can also change other settings in Settings > Mail—such as Collapse Read Messages or Most Recent Message on Top.
Show To and Cc labels in your Inbox
Go to Settings > Mail, then turn on Show To/Cc Labels (below Message List).
You can also view the To/Cc mailbox, which gathers all mail addressed to you. To show or hide it, tap in the upper-left corner of the Mail app, tap Edit, then select “To or Cc.”
Add someone to your contacts or make them a VIP
In an email, tap a person’s name or email address, then do one of the following:
Add to your contacts: Tap Create New Contact or Add to Existing Contact.
You can add a phone number, other email addresses, and more.
Add to your VIP list: Tap Add to VIP.