The comands & the procedure you have posted is exactly the way email was sent in its early days of infancy.Its perfectly alright to send email where you are a legitmate user & have proper authentication details for the same.
Though using some one else's email server to send your email much as in the case of a open relay is absolutely ILLEGAL.In simple words its nothing but email server hijacking.
The consequences your IP being banned or perhaps even the IP range,report of your hijack to your ISP which may take further action.
Though using some one else's email server to send your email much as in the case of a open relay is absolutely ILLEGAL.In simple words its nothing but email server hijacking.
The consequences your IP being banned or perhaps even the IP range,report of your hijack to your ISP which may take further action.