Hello Dear,
I am writing you to apply to the position of Systems Administrator. I have 5+ years experience. During my career I have worked on UNIX, LINUX, Ubuntu, VPN, Open VPN, VPS, SSL, SSH, Apache, Network security and many.
Now, coming back to the job, I checked your requirements very carefully, I can easily help you to fulfill your requirements.
I strongly believe that I can be a real and immediate asset to your job.
Thanks and Regards