Mails that are sent from the contactform on NLWiki end up in the Probably Spam queue of OTRS. According to OTRS admin Krd this is due to the "Precedence: Bulk" header.
Mails from the contactform send on June 10th or earlier don't have that header, mails sent from the contactform on June 12th and later do have this. (Ticket:2015061010017899 doesn't have the "Precedence: Bulk" header and Ticket:2015061210010731 does have that header. The contact form wasn't used in between those two mails)
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Unless there's something within MediaWiki to do, I've made an adjustment within OTRS which should correct this issue. I've created a filter which should divert any mail sent to WikiAdmin~nlwiki <info-nl@wikimedia.org> (which is what is in the header of messages sent via that form) the info-nl queue.
That should resolve things. OTRS agents can see further details at https://otrs-wiki.wikimedia.org/w/index.php?diff=60126.