Just received a genuine link to download an update to my VAT filing system, but the link does not work in BT Mail (PC), but works fine in Thunderbird. I guess BT have stripped the link to prevent malicious links from doing hard which is commendable, but in this situation the link is good. I tried to save sender to safe sender's list, but link still inactive.
Another work round is clicking "view this email in your browser" option, if available.
Just checked other emails with embedded links and they all work, some have "view this email in your browser", some don't. A little mystifying!