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Make sure a trailing brackets corresponds to a leading one #174

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This fixes the case where the sender e-mail address is user@example.net>
Without this fix, OpenDMARC parses the domain as example.net> and skip
DMARC processing since there is no policy for the domain.

Unfortunately, the MTA or MUA tend to fix the trailing bracket on their
own, letting forged e-mail passing through to user mailboxes.

This fixes the case where the sender e-mail address is user@example.net>
Without this fix, OpenDMARC parses the domain as example.net> and skip
DMARC processing since there is no policy for the domain.

Unfortunately, the MTA or MUA tend to fix the trailing bracket on their
own, letting forged e-mail passing through to user mailboxes.
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