Hi! I can confirm this. I havee the same "issue" on Debian. And I have the
package gnupg-agent installed.
The warning icedove gives when I try to change the cache time (set to 5
minutes but not working at all) is:
Cannot connect to gpg-agent. Maybe your system uses a specialized tool for
passphrase handling such as gnome-keyring or seahorse-agent. Unfortunately
Enigmail cannot control the passphrase timeout for the tool you are using.
Therefore the respective timeout settings in Enigmail are disregarded.
I do use gnome-keyring though, so I guess that is the issue. I guess there
may be a way (maybe) to direct icedove into using the desired caching tool
but I ignore it.
Fortunately, even if complex, I know my psswd by heart but this is still
quite annoying especially when I receive several encrypted mails and have to
reenter my psswd 10 times! :)
Will enquire more and if I do find a solution will report back. cheers