Sending email based on field name UTL_MAIL.send - oracle

Question

How can I send an email based on what is entered into a apex Text field. eg If I enter me#test.com in :p6_supervisor, I would like the email to be sent to that person.
At present I have a preset UTL_MAIL.send which is working.
begin
UTL_MAIL.send(sender => 'test#test.com',
recipients => 'test1#test.com',
subject => 'Test,
message => 'Please Note this is a test' );
end;
But of course its for another purpose, which is sending email to one recipient from a trigger.
Below is the Cursor example
create or replace function "email"
( name_in IN varchar2 )
RETURN number
IS
supervisoremail varchar2(30);
CURSOR c1
IS
select
supervisoremail
from
EMPLOYEE,supervisors
where TO_DATE(contract_start_period,'DD-MM-YYYY') < TO_DATE (SYSDATE,'DD-MM-YYYY') - 275
and (supervisors.supervisorname = employee.supervisorname1
or supervisors.supervisorname = employee.supervisorname2)
and employee_name ='test'
;
BEGIN
OPEN c1;
FETCH c1 INTO supervisoremail;
CLOSE c1;
RETURN supervisoremail;
END;

Answer 1

It'll work, no problem. A simple way is to
create a text item (P6_SUPERVISOR)
create a button which submits the page; you need it so that P6_SUPERVISOR's value is set into the session state
create a process which calls UTL_MAIL; P6_SUPERVISOR item's contents is used as a source for the RECIPIENTS parameter. For example:
UTL_MAIL.send (sender => 'test#test.com',
recipients => :P6_SUPERVISOR,
subject => 'Test message - subject',
MESSAGE => 'Test message - message body');
[EDIT: how to send mails in a loop?]
I'm not sure what you meant by creating a function; it returns just one e-mail address that, probably, belongs to name passed through the NAME_IN parameter (but you used the 'test' name in cursor query).
However, you specified that the function returns a NUMBER, while variable you're selecting the result into is a VARCHAR2. So, which one of these is true?
If you insist on a function, don't enclose its name into double quotes as you'll always have to reference it that way (double quotes, correct upper/lower/mixed case).
Furthermore, what is contract_start_period column's datatype? If it is DATE, don't TO_DATE it. The same goes for SYSDATE - it is a function that returns DATE datatype anyway, so it is wrong to convert it to date once again.
Here's an example which uses a cursor FOR loop (as it is easier to maintain) and sends mail to all supervisoremail addresses returned by that SELECT statement.
begin
for cur_r in (select supervisoremail
from employee e join supervisors s on s.supervisorname = e.supervisorname1
or s.supervisorname = e.supervisorname2
where contract_start_period < sysdate - 275
and e.employee_name = 'test'
)
loop
utl_mail.send(sender => 'test#test.com',
recipients => cur_r.supervisoremail,
subject => 'Test message - subject',
message => 'Test message - message body');
end loop;
end;