You can reply to and forward emails in the Mail app.
Go to the Mail app to send.
When you reply to an email message, you can include text from the sender to clarify what you’re responding to.
Go to the Mail app > Apps > Mail > Increase Quote Level (below Composing), then turn off Increase Quote Level.
You can send an email message forward to new recipients.
Go to the Mail app iCloud.com, you can set up an automatic reply to respond to incoming email messages or automatically forward messages to another inbox. See Check your email in Mail on iPadSave a draft in Mail on iPad