Indent or Decrease Indent Text in Forwarded iPhone Email
The most recent remark in an email thread is colored black. After that, the text entries from the email participants appear in different colors. The degree to which the text is offset is referred to as the quote level. In replies to emails, delete unneeded portions of the email for clarity. When you forward an email message, you can change the quote (and indent) level of the text with a few taps. To increase or decrease the level of quotation for selected text in a forwarded email:
Add Quotation Levels Manually in New Mail
The Mail app adds the quotation levels automatically as emails are exchanged in a thread. To apply quotation levels manually in a new outgoing email you are composing, select the text you want to apply a quotation level to and choose Quote Level > Increase (or Decrease) from the pop-up menu, the same as you do when changing levels in a forwarded email.