Write an email in Mail on iPhone
Use the Mail app 
to keep in touch with friends, family, and colleagues. You can send and receive photos, videos, drawings, documents, and more.
WARNING: For important information about avoiding distractions that could lead to dangerous situations, see Important safety information for iPhone.
Add additional mail accounts
Go to Settings 
> Passwords & Accounts > Add Account > Other > Add Mail Account.
Create an email message
Tap 
. Touch and hold to view draft emails you’ve saved.
Ask Siri. Say something like: “New email to John Bishop” or “Email Simon and say I got the forms, thanks.” Learn how to ask Siri.
Add attachments to an email
Double-tap in the email body, tap Add Attachment, then select a document in Files.
Quote some text when you reply to an email
Touch and hold in the body of the email, then select the text you want to include.
Tap
, then tap Reply.
To turn off the indentation of the quoted text, go to Settings > Mail > Increase Quote Level.
Insert a photo or video
Double-tap in the email body, then tap Insert Photo or Video.
Draw in your email
Double-tap in the email body, then tap Insert Drawing.
Use the drawing and annotation tools.
Tap Done, then tap Insert Drawing.
See Use Markup in apps on iPhone.
Change your email signature
Go to Settings > Mail > Signature.
Tip: If you have more than one mail account, tap Per Account to set a different signature for each of them.