How to replythank u on mail to sir

Here are a few ways you can reply "thank you" to a mail addressed to "Sir":

1. Simple and direct: Dear Sir, Thank you for your email. Best regards, [Your Name]

2. Polite and formal: Dear Sir, I would like to express my sincere gratitude for your email. Thank you for taking the time to reach out to me. Best regards, [Your Name]

3. Formal and professional: Dear Sir, I appreciate your email and would like to extend my gratitude for your consideration. Thank you for your time and effort. Best regards, [Your Name]

4. Informal and friendly: Hi Sir, Thanks a lot for your email! I really appreciate your time and effort. Best regards, [Your Name]

Remember to always proofread your email for grammar, spelling, and punctuation errors before sending it.