In the RSS specifications, the "link" tags contains the URL to follow,
and the "guid" contains a unique identifier (which may or may not be an
URL).
RSS clients should always use "link" to follow the link (and most do),
but Thunderbird uses the "guid" if it find a valid URL inside (and only
falls back to "link" if "guid" is not an URL).
I have patched the RSS feed so that Thunderbird ignores the URL in guid.
This is necessary because some hosts do not have a properly set
session.save_path parameter in php config, or do not have write access
to the directory.
This corrects the session problem with some browsers when Shaarli is
hosted on a sub-domain. Please tell me if this corrects login problems
if you had one.
