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I do not see any issue in writing “Thanks and Regards” in signature .
Few of my colleagues said that “Thanks and Regards” should not be used as both the terms convey the same message and cannot be used together .

I was under impression that “thanks” is just to appreciate someone for the help and Regards to show respect towards the recipient.
I was trying to see results in Google ,but was not impressed with any logic which strongly approves that” thanks” and ” regards” cannot be written together.

Please advise
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Anonymous“Thanks and regards”
This is a common, casual complimentary closing. It should not be used in serious business communications.
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Thanks Mister for your response on this. I would like to know, if it is incorrect to write "Thanks and regards" irrespective of communication type.
Anonymous I would like to know, if it is incorrect to write "Thanks and regards" irrespective of communication type.
Please read my first post, which answers your question precisely.