The Email settings tab specifies the SMTP servers used by Network Monitor to route outgoing email to users.
Primary SMTP server
SMTP server - The SMTP server is used to send email notifications to users. Enter the address to the SMTP server you want to use. Note that the SMTP server must be able to accept all the email addresses that you are planning to use. This is the primary SMTP server normally used.
SMTP server username and password - If your SMTP server requires authentication, enter the username and password in these fields.
Return email address - Most SMTP servers are configured to only accept incoming emails with a valid return address. Since Network Monitor is unable to receive emails you must specify a return address for emails that cannot be successfully delivered.
Port - Defaults to 25.
SSL - If checked, connects to the email server using SSL.
Secondary SMTP server
SMTP server 2 - The secondary SMTP server is used when Network Monitor cannot connect the primary SMTP server.
SMTP server username and password - If your secondary SMTP server requires authentication, enter the username and password in these fields.
Return email address - Most SMTP servers are configured to only accept incoming emails with a valid return address. Since Network Monitor is unable to receive emails you must specify a return address for emails that cannot be successfully delivered.
Port - Defaults to 25.
SSL - If checked, connects to the email server using SSL.
SMTP HELO ID - If required, a custom HELO identifier can be specified for the SMTP servers.
> System settings > Mail, SMS & messaging > Email settings tab