How to use swaks to send a test email?

Swaks can be downloaded here.

Example command line to send a test email:

./swaks --auth \
        --server SMTP.SERVER.COM \
        --au USERNAME@YOUR_DOMAIN_NAME \
        --ap YOUR_PASSWORD \
        --from USERNAME@YOUR_DOMAIN_NAME \
        --to DEST@EXAMPLE.COM \
        --h-Subject: "This is a test email" \
        --body "Hello, World!"