When I email, I now cannot make links, am on Firefox and using yahoo email. The link appears just like normal with no difference in colour or underlined and of course, won't link. Have tried tinypic, and imageshack.
I gave up on Yahoo! mail many years ago, so I'm no expert but have you tried inserting the full URL (including the 'http' bit)? It's certainly necessary when using Firefox (and, I believe, any other browser) to post on AB. For example, this text won't hyperlink:
www.google.co.uk
but this will: http://www.google.co.uk/
To the best of my knowledge, e-mail clients (such as Outlook Express) automatically recognise 'www' as indicating a hyperlink but web browsers don't.