Thunderbird does not have a "BLOCKED SENDERS" list

This answers my second question but not the first. I think Thunderbird must support filtering but from your answer, I cannot give Thunderbird my present list of about 500 Blocked Senders and have it block these.

Others DO !

So if I was Sandy, I would stick to Outlook or at least search for another solution than Thunderbird dealing with IMAP.

I'm myself also disappointed by the complicated settings to block senders. I wonder if any universal software can "transfer" and sync one or more lists blocked senders between several email programs. But that's another question.

@Merel, I find it amusing that people have hundreds of blocked senders. I have been using internet mail since late 1980s. I have been actively using some of my mail accounts since before the Millennium. I have no blocked senders.

I used to have blocked senders in MSN messenger and Yahoo messenger as it was the only SPAM control option available, but I have Zero blocked senders in my mail client. I certainly get loads of spam in my Yahoo account, it is something Yahoo appear to be incapable of managing. I get very very little in my other mail accounts, so other providers can mange it.

Thunderbird does an excellent job of managing my spam with only a few each day making it to my inbox.

You appear to think transferring this list from client to client is important. I would really like you to tell me why! Then I would love an explanation why you think syncing of such list has merit.

Most people with lots of blocked senders appear to think a blocklist is a SPAM management tool. It is not. Either they are using blocked senders for SPAM control, something that is simply not appropriate as it is a slow process. To place each mail in a list and check it against 500 email addresses you don't like simply bogs down the receipt of mail.

Or they are and a particularly unlikable person that just