The information in the email parameters varies according to environment, you have to fill in data according to your current SMTP server details. This information is required to send outgoing email.
Are you using AX2012? Can you please confirm if you are trying to send email on posting or printing report on screen. This setup is done in posting form, if you check the print check box it will print and if you check the use print management check box , system will use the current print management setting to either send email, save in pdf ,etc.
Print management settings are available in vendor/ PO level (PO/General/Print Management settings). Read below articiles on how you can send email using SMTP.