You don't!
You should not even try to remove it. It's an indispensable service needed to transfet e-mails.
Anyway, it don't reside on your computer, unless you appen to be running a mail server. It runs on your ISP or webmail provider.
If you get a message from it, it tells you that some e-mail delivery failled for some reason. The reason is explained in the notification.
That notification is in plain text.
If it contains ANY attachment, it's possibly a fake. Read the text, but NEVER open any attachment and DON'T follow any link.
Message say: user/recipient unknown.
Double check the addresses of your recipients, some may be no longer valid/active.
Check if ther inboxes are full. Full inboxes can't receive your message and generate a mailes daemon notification.
daemon stands for:
Data
Access and
Exchange
MONitor
Electro, April 2011