I posted a similar question on nodemailer on github and someone was able to help me there by indicating that it might be an issue in the TLS library of Node v0.10.x and that I could address it by changing my options to be:
{
host: "mail.hover.com"
secureConnection: true
port: 465
auth: {
user: "---"
pass: "---"
}
tls: {
secureProtocol: "TLSv1_method"
}
}