have it in the email vs have it on the email

Some examples from the web:

• The email client for the K Desktop Environment.
• Filling out the Email Address field is mandatory.
• If you choose the option 'My email', the email address is pre-populated with the email address related to your User Area account.
• Or was when she sent the email.
• The email had this great no-BS vibe.
• This is the email that Alan sent the bar association.
• She was reading the emails that you sent to the first woman.
• Okay, well, the email suggests a premeditated abduction.
• It contains the email addresses of the entire American cell.
• The email address is not valid. Cannot generate a new key pair.
• Clicking the Cancel button will cause the email operation to be terminated.
• The email address you have entered is invalid.
• The email address you provided is not valid.
• The account associated with the email address provided has been disabled.
• You have to enter something in the email address field.
• The email address you entered is not valid because it contains unclosed comments/ brackets.
• The email address you entered is valid.
• The email address you have entered is not valid because it contains an unexpected comma.
• The email on his computer was bait.
• Enter the email address and password for your SmugMug account

Some examples from the web:

• The email client for the K Desktop Environment.
• Filling out the Email Address field is mandatory.
• If you choose the option 'My email', the email address is pre-populated with the email address related to your User Area account.
• Or was when she sent the email.
• The email had this great no-BS vibe.
• This is the email that Alan sent the bar association.
• She was reading the emails that you sent to the first woman.
• Okay, well, the email suggests a premeditated abduction.
• It contains the email addresses of the entire American cell.
• The email address is not valid. Cannot generate a new key pair.
• Clicking the Cancel button will cause the email operation to be terminated.
• The email address you have entered is invalid.
• The email address you provided is not valid.
• The account associated with the email address provided has been disabled.
• You have to enter something in the email address field.
• The email address you entered is not valid because it contains unclosed comments/ brackets.
• The email address you entered is valid.
• The email address you have entered is not valid because it contains an unexpected comma.
• The email on his computer was bait.
• Enter the email address and password for your SmugMug account