Can you please fix the errors in this sentence? or inappropriate choice of words..?

Question

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Dear sir, please send me emails only to this email address: [e-mail]. This is the only email that I regularly check.

While [e-mail] is just a secondary email address. I only use and log in only when I failed to send emails from [e-mail]

Thanks,
Jack

Answer 1

Dear Sir,
Please direct all of your emails to the following address: [e-mail]. since I check it on a regular basis

Cocnerning [e-mail] I use it only when I fail to send emails from [e-mail] (Useless sentece though)

Thanks,
Jack

Answer 2

Dear Sir,
Please send my emails to this address: [e-mail]. This is the only email that I regularly check.
Thank you,
Jack
The rest of what you've written is unnecessary. Keep it simple.

Answer 3

Dear sir, please send any Emails to [e-mail]. A secondary email address, [e-mail], is only used when I don't send emails from the [e-mail] address.

Thank you,

Jack

Answer 4

"Dear sir, please send emails to me at [e-mail]. This is the only email address that I check regularly. Thank you."

The rest is unnecessary.

Answer 5

Dear Sir,my preferred e.mail No is [e-mail] My second e.mail No is [e-mail] Please send my e.mails to both Nos. yours sincerely Jack.