URLs in my emails not "clickable"

NO problem, Booklover; I appreciate all attempts at helping fix this.
 

My Computer My Computer

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Windows 7
OS
Windows 7
I think the way to get a web address clickable in a signature is to use html formatting,

AND

WLM 2011 seems to add a space automatically after the signature website address. I found that by deleting this space and then placing a manual carriage return (press enter) after placing the signature in the message, the signature website address is clickable. I have been unable to do this in the actual signature window itself.

I have found that even in messages formatted in plain text, adding that extra carriage return (pressing enter) makes the signature website address clickable--in most cases.

I experimented with this by sending test emails to comcast, yahoo and aol. Only the yahoo email's website signature was not clickable in plain text.

I have no idea why.
 

My Computer My Computer

At a glance

Windows 10 Home, 64 bitIntel Core i7 860 @ 2.8 GHz8.0 GB Dual Channel DDR3 @ 664 MHz (9-9-9-24)nVidia GeForce GTS 240
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Dell Studio XPS 8100, Dell XPS 15 laptop
OS
Windows 10 Home, 64 bit
CPU
Intel Core i7 860 @ 2.8 GHz
Motherboard
Dell 0T568R (CPU1)
Memory
8.0 GB Dual Channel DDR3 @ 664 MHz (9-9-9-24)
Graphics Card(s)
nVidia GeForce GTS 240
Sound Card
M-Audio Delta Audiophile 2496
Monitor(s) Displays
Dell 2407WFP
Screen Resolution
1920x1200
Hard Drives
977 GB Western Digital WDC WD1001FAES-75W7A0 (SCSI)
Antivirus
Windows Defender, MalwareBytes Anti-Malware, AdwCleaner
Browser
Firefox, occasionally IE and Edge
Other Info
Mozilla Firefox, Mozilla Thunderbird. Western Digital Passport 250 GB external HD, two Mushkin Enhanced Mulholland 32GB USB flash drives, AKG K240 Studio headphones, Asus AC-1900 dual band wireless router.
...the URLs I had in my website were not clickable, SOME of the time. It seems that if I have "Plain text" showing in the "New Message" then they will NOT be clickable and it it shows "Rich text" they are. I want them all, to always be clickable no matter which email addy I send from, and all replies as well.
Uncheck the "send tab" option "Reply to emails using the format in which they were sent."
 

My Computer My Computer

At a glance

Windows 8 Pro w/MC 32-bitIntel Atom 1.86 GHz2 GBIntel GMA 500
Computer type
PC/Desktop
Computer Manufacturer/Model Number
OQO 2+
OS
Windows 8 Pro w/MC 32-bit
CPU
Intel Atom 1.86 GHz
Motherboard
OQO 2+
Memory
2 GB
Graphics Card(s)
Intel GMA 500
Sound Card
IDT
Monitor(s) Displays
LCD
Screen Resolution
800 x 480 (portable) 1280 x 1024 (docked)
Hard Drives
64 GB SSD
PSU
9 Ah Battery (portable) or OQO Brick (docked)
Case
Shirt Pocket Sized
Cooling
Tiny Fan
Keyboard
Slide out (portable) DiNovo Edge (docked)
Mouse
Eraser head (portable) Logitech Bluetooth (docked)
Internet Speed
WWAN or 802.11G (portable) T1 (docked)
Browser
IE 10
Other Info
DVD-RW OQO Docking Station
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