You’ve created a signature with a logo, links and text formatting and it works great. So far so good...
Out of the blue, your great looking email signature suddenly disappeared.
The reason is that you are replying an email which is in Plain Text (TXT) format. No worries... it's easy to create an email signature in plain text.
Note: The plain text signature will not look the same as it does in HTML format. As the name suggests, Plain Text does not support any type of formatting.