I have a HTML signature which I placed in Outlook 2010 and 2016.
Everyting is fine.
But only on Desktop.

Open the email on an iOS device the signature is shrinked and adjusted to the iOS device width.

The email text above the signature has the original size.

I've tried this

> <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">

But with no result.

Any thoughts?