How do I get SM to stop marking e-mails as 'SPAM'

[HenriK]

SM has suddenly started marking selected incoming e-mails as 'SPAM'.  I 
don't know if that is SM's doing or whether it is being done by an 
'add-on' that has been activated inadvertently.

Can anyone give me some hints on where to look to get this feature 
turned off?

Thanks, in advance, for any assistance.
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