This is hopefully a very simple question that I should know the answer, but don't have a clue.
When I email from my Thunderbird client that contains a "valid formatted" web or email address, the recipient will see the link as highlighted in blue that if you click on it, it will go to that link, or launch a mailto if it is an email address. It is not necessary for me to do anything to "embed" a link.
However, if I am receiving emails using my Thunderbird client that happen to come from a Yahoo web email client, NONE of the web addresses are "blue" with a hyperlink. If I go into the web based Yahoo client and highlight the text, and then go to icon to insert a link, it will ask for a web address, and when this is received, there is an embedded link.
I don't understand as this seems to be inconsistent between different users of web email. I get many emails that have the links embedded. People tell me that they don't do anything special to embed a link. However, I tested with my Yahoo web email and another web based email by NetworksSolutions, and both of these web clients did NOT automatically create a web link, requiring me to do a "copy and paste" to the browser to follow the link.
Can someone tell me what is going on with this?