Ending a formal e-mail

Hi all,

I’ve been told that the following sentence:
“I hope to have informed you sufficiently” is incorrect.

Unfortunately I cannot seem to find the correct version.
I hope someone can help me.

Thanks in advance,

Mike

Hello Mike-- and welcome to English-test.net.

Yes, that sentence is not right. I suggest something like this:

I hope this has answered your inquiry adequately. Please feel free to contact me again should you have any further questions.

Thank you Mister Micawber, that’s exactly what I was looking for!