It seems the latest owners of freedom2surf i.e. talktalk are not able or willing to give details for those of us who still have a f2s.com email account.
If you have tried contacting talktalk.net support they are likely to tell you they don’t know who freedom2surf are.
Now if you are trying to
Using Outlook, Mozilla Thunderbird or most other clients
IMAP Details are:
Incoming mail server = inmail.f2s.com on port 143
Outgoing mail server = outmail.f2s.com on port 587
(outgoing server may be different if no longer using f2s or
Essential! Username = yourusername-f2s.com (the username is whatever your email address is but instead of using @ change the symbol to –