I assure you, that you are no the only organization who has had a similar experience. While we of course will continue working with all email providers, it would be best to mention your displeasure with this feature directly to Google's support teams. There are a few ways to ensure that your email makes it to people's inboxes, but the most effective by far is to have them add your 'from' email address to their actual contact list. Gmail will often automatically remember people you've emailed frequently, so many users do not bother with adding companies to their contact lists. If they do add you though, that should more effectively ensure that your emails do go to the inbox, rather than the Promotions tab.
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