Dear Client. How are you today? I hope you are doing well.
I found your job posting and I think I'd be a great fit.
As a senior full stack developer, I am very familiar with SMTP, Proxy, email system and etc.
I have checked your job post carefully and it can be completely solved in the shortest time with my skills and experiences.
Based on good past experiences, I can offer a rapid turnaround, dedicated commitment and you would benefit if I am hired.
I am online most of my time, so I can quickly and fluently communicate.
I can start work immediately and provide you the best result.
Waiting for your positive reply.
Best Regards.