Recently mail from two senders is being diverted to Spam. No Filter Rules are set. When mail in Spam folder is marked as “not spam” it is returned to the Inbox but only stays there for a short time before being moved back to Spam.
Does anyone have any suggestions?
If you're describing the operation of TalkTalk Mail when signed in to webmail and finding that incoming mail to the Inbox is diverted to Spam then that's usually because it's been detected as spam or is unauthenticated.
To unmark a previously marked spam email select the email from the Spam folder and use the Not Spam selection on the toolbar or in the drop down more actions menu within the email display. The email will be moved back to the Inbox. The TalkTalk blocking filters are notified that you've unmarked the email as spam.
There is nothing currently capable of operating on mail in the online Inbox to return that mail to the Spam folder. So, anything doing that has got to be an external email client or app connected as an IMAP account to the mailbox. i.e. a spam filter rule is detecting the arrival of the spam in the Inbox of the email client and that spam filter rule is moving the mail into Junk/Spam.
If you have got an email client connected to the mailbox then check that out. if not you, then change your mailbox password to lock out any unauthorised connections. Changing your email password
Many thanks or the prompt reply.
As suggested, the problem was the email client on my phone.
All now happily resolved after uninstalling client and then reinstalling.