how to send mail using peoplecode

It is not possible to send HTML embedded emails using PeopleSoft standard Workflow Technologies. However it is possible to send HTML embedded emails using SENDMAIL function.

All About SENDMAIL function:
Below is what is specified in PeopleBooks on SENDMAIL function. After the end of the transcript on SENDMAIL function.

Example
The following example sets up several variables that are then used to construct an email message that
includes two attachments:
&MAIL_FLAGS = 0;
&MAIL_TO = "jagruthi@peoplesoft.com;surya@peoplesoft.com";
&MAIL_CC = "";
&MAIL_BCC = "mom@aol.com";
&MAIL_SUBJECT = "Live long and prosper!";
&MAIL_TEXT = "Please read my attached CV. You will be amazed and hire me⇒
forthwith.";
&MAIL_FILES = "c:\mydocs\resume.doc;c:\mydocs\coverlet.doc";
&MAIL_TITLES = "My CV;READ ME";
&MAIL_SENDER = "MyEmail@Yahoo.com";
&RET = SendMail(&MAIL_FLAGS, &MAIL_TO, &MAIL_CC, &MAIL_BCC, &MAIL_SUBJECT, &MAIL_⇒
TEXT, &MAIL_FILES, &MAIL_TITLES, &MAIL_SENDER);
if not (&RET = 0) then
WinMessage("Return status from mail = " | &RET);
end-if;