Are both "in regards to" and "regarding to" correct?

Question

Do _in regards to_ and _regarding to_ imply different meanings or is it okay to use them interchangeably? Example: > This mail is in regards to your inquiry. > This mail is regarding to your inquiry.

Answer 1

Neither is correct. However, "in regard to" and "regarding" would both be correct.

Answer 2

"In regards to" would be the correct phrase here. You would ask someone "What is this email regarding?" but wouldn't follow it with "to."