How do you sign on to your email acct? If you are using 2 step auth you will have to change your email provider entries to make an exception for your client/device.

Thanks; it is not a simple problem

Please cease with the duplicate questions.

Then perhaps reply to yesterdays response instead of offering yet a third question on exactly the same topic.

https://support.mozilla.org/en-US/questions/1436353

It is not a simply problem and asking the same thing over and over and failing to interact really does not help the process at all. You are going to have to role up your sleaves and get your hands dirty and do most of the comparisons and checking and replying yourself. No one in this forum can do it for you. I am done here. If you want to continue the original discussion, I suggest you respond there.