After finding spam entries for a valid address, the "Not Spam" button does not correct the problem.
The "Not Spam" button seems to attempt a removal of a specific address from the spam listing and, perhaps, momentarily move it to the inbox; However, something repopulates the spam filter with the address that was just declared as "Not Spam" !
Wšě wotmołwy (1)
hi, you're posting in the firefox support forum - firefox is a browser and doesn't handle your emails. in case you're using thunderbird as a mail client and have a question about it please say so, then we will move your question into the thunderbird queue. if you're accessing your mails through webmail, contact your email-provider in order to help you further...