getaddr confusion

I am using getaddr in .mailfilter to extract addresses:

if( /^From:\s*(.*)/:h )
{
 FRM=getaddr($MATCH1)
}

I have added log "$FRM" to the .mailfilter file to investigate, and it
fails to extract the address from lines like this:

From: "Someone - Mailbox" <[email protected]>

But it will work with:

From: "Some One" <[email protected]>

I guess the hyphen is causing trouble - is this a bug or am I failing
to understand?

Regards,

Neil.

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