I've been using Thunderbird for years. I have recently added mails to my mobile phone, but want to continue receiving my mails on my laptop, as that is where I will send out from. Lat few days I have not been able to send mails, and can now not even access my mails, and get a message mentioning imap login failed. I do not know what that means, nor am computer savvy. Is there an easy way to fix this, or if not, do I lose all my mails if I decide to stop using this mailbox in future

I will not be able to access answers you send on this mail, which makes the problem even more irritating