Just to elaborate on that, I typed out an email on Word and copied it to Yahoo Mail and I noticed that one paragraph had been hyperlinked automatically! There isn't supposed to be a hyperlink there! So, I deleted the text and typed it out again on Yahoo Mail and there was that hyperlink again. This happened several times, but eventually it allowed me to type it without a hyperlink. But after sending it, the same paragraph was hyperlinked again!
I tried clicking the link and it doesn't go anywhere. I tried copying the email text to Word and editing the hyperlink, but it just showed me that the link was empty.
I tried opening it on my Android phone – tapping the link opened a blank chrome tab, but long-pressing the link gave me this x-thread://-76874911/10984
There is no reason for the software to assume that it is a link. The entire para is just plain text, like "Once upon a time, email got weird etc. etc."
Any idea what that is? Or why some random text on my email got hyperlinked?
Best Answer
This is a bit of a guesswork answer, based on the Q&A in comments. Feel free to add further detail if anyone knows how this may have happened.
My initial guess was that Word had some invisible embedded RTF instructions or similar, that it was carrying over in the copy/paste.
Experimentation has proven this to be the most likely explanation - though the 'why' remains elusive.
The 'simple fix' is to copy/paste from Word into any app that can only handle plaintext, then copy/paste back again, based on the theory that the 'RTF' data would either be exposed by this method, or discarded entirely.
This appears to be totally successful.
However, as the extra data causing the issue seems to be completely discarded in the copy via plaintext, I can't figure out exactly what is was that caused the issue.