Inappropriate hypertext formatting being imposed in MacMail
I'm not sure if this happens always or sometimes but just now, when typing an email in MacMail, after I had pasted in a url all the text after it was formatted in blue with an underline. I could not find a way of getting rid of this. I tried typing my words to follow the url UNFORMATTED in another application and then pasting them into the email, but the unwanted formatting was still imposed on them there.
As I say, I have a vague feeling that this is not invariably what happens, but I don't think I've done anything special to make it happen today and I certainly can't find a way to stop it.
I am using Mohave but have been for a few months.
iMac 21.5", macOS 10.14