The SMTP-settings are required to enable sending emails via your own SMTP server directly from your eRecruiter instance, applicant portal and customer portal. The configuration of the SMTP-Server requires the following parameters:

• global sender address
• global sender name
• SMTP host
• SMTP port
• SMTP user
• SMTP password
  
• SMTP over SSL
• Fallback Sender
  

Those can be set in Administration → Miscellaneous → Mandator settings → SMTP and Email settings.
This information is to be provided by your IT department.