Ricoh M281 Series Service Manual page 820

Scanner Features (MP 501/601 Only)
If this is done:
1. The "Mail From: field = device (Fig.1 )
2. The mail header "From:" field = administrator (Fig.3 )
3. The SMTP username = device (Fig.1 )
1,2 and 3 must match and the authentication should be successful.

The user's email address will still be inserted into the reply-to field.
Fig.1 Default device SMTP username, password and email address
Fig.2 A user's email address in the Address Book
Fig.3 Administrator's email address
D255/D256/M281/M282 4-12 SM Appendix