How does SD+ detects if an incoming mail should be appended?

How does SD+ detects if an incoming mail should be appended?

Hello,

Everything is in the title ... How does SD+ detects if an incoming mail should be appended? I'm having problems with mails not being appended when they should.
Is that because I changed the "Subjects" of automatic replies ? (I use :
Re: [SD#$RequestId] $Title
)

Thanks





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