Ricoh Aficio MP 161SPF - Manual (Page 277)

Searching
269
7
Searching by E-mail Address
Search the address book using registered e-mail addresses.
A
Press [Search].
B
Select [Search by E-mail Address] using {U} or {T}, and then press the {OK}
key.
C
Enter the e-mail address you want to search for, and then press the {OK}
key.
You can also search by entering part of the e-mail address.
D
Press the {OK} key.
The search results appear.
E
Select the name using {U} or {T}, then confirm it by pressing {V}, and then
press the {OK} key.
Reference
"Entering Text", About This Machine