Dear sir.
I have reviewed your job description very carefully, I feel that I'm an exact match for this position.
I have good experience using SonicWall firewall.
Over the last 10+ years, I have been working as network and system ADMINISTRATOR.
Then I have build many firewall as system administrator.
I can work full-time on Monday to Friday, and will be good assistant.
Please explain my job more details.
I am very flexible in working time and communications. I can follow all your requirements and can advice good solutions to accomplish this job effectively and with the genuine budget.
Waiting to hear from you.
Best Regards.