One needs to beware of the behavior regarding the use of hyperlinks within email posts.
Short one will almost always work, such as #1 and #2. Longer ones, like #3 and #4 will almost always fail IF you just click on the "blue" hyperlink text. If you copy and paste the entire string into a browser as an URL, they will generally work.
One of the main reasons for this is companies like Amazon and eBay are allowing very large titles (to take advantage of user keyword searches). This can result in a string with many lines. Sometimes only part of the line will be recognized as a hyperlink and sometimes the various email servers can truncate the string.
My recommendation has always been to identify the actual site and then list the keywords for searching rather than simply copying and pasting the address from the browser address bar into your email.
(Here is the actual Amazon title - meant to lead the user to this page from keywords:)
Xiegu GSOC Remote Controller LCD Touch Screen for Xiegu G90 HF Amateur Radio Transceiver, Spectrum & Waterfall Display, Supports Mouse & Keyboard Operating
Using hyperlinks in messages can be frustrating for both the sender and the member trying to use it...