emails incorrectly identified as spam

[Kaymo]

a large number of important emails are being incorrectly identified as spam. Despite repeatedly telling the filters that they are Not spam, they disappear from spam temporarily then almost immediately reappear in the spam folder. Any ideas

[Gondola]

Does the header have entries like this:

X-VadeSecure:

X-Bulk-Message:
X-Spam:

If so, or if there are other relevant entries made in the header then it would be useful to know what's on the rest of those lines. There obviously a system that's marking the mail as spam. Are these emails all from a single source? If so, what source?

[Kaymo]

Thanks for your reply, but I was using webmail, and no other email client. Despite marking emails that the webmail system had marked as spam, while they were transferred to the inbox, when I accessed the inbox they returned to the spam "folder". It didn't seem to matter how many times I identified them as "Not spam", they still ended up there.

If I downloaded them to my client (2 different ones  - Bluemail, or Thunderbird) the spam label wentr =with them, and made them difficult to handle. These emails were previously not identified as spam!

[Gondola]

No response from the original poster so topic closed.

[Gondola]

In TalkTalk Mail when you mark a message as Not Spam that action notifies the TalkTalk network filtering of your acceptance of the mail message and moves the message back to the Inbox. However in the current mail platform the sieve for Filter Rules does not operate on mail that's already arrived in the Inbox only on mail that is inbound and destined for the Inbox. So even if you had a Filter rule running in your online mailbox that Filter rule would not operate on that particular message.  

Therefore the action of moving the mail message back to the Spam folder must be an external filter rule in an email client.

What email software are you running and on what operating system?  And have you checked the Filter rules for that software?