Recently, I have set up a webmail account at gmx.com. This is a simple webmail with IMAP capabilities. I have Thunderbird installed on my computer and I can use it to read my webmail with IMAP. This all works fine.
However, I have two email-addresses in my webmail account: One 'normal' address I use for work, and a synonym(Different address people enter, but mail ends up in the same inbox) I use for home-related stuff.
Now I can only send from the main address in Thunderbird. Is there a way to select the synonym address instead?