Not sure which email infrastructure being used @gohugo.io, but if your emails (transactional or bulk) aren't making it into people's inboxes...might be time to consider switching.
I'm the Principal Developer Advocate for SparkPost (https://sparkpost.com). We give you 10K emails/month for free and it is built upon the same powerful email platform (Momentum by Message Systems) being used by: Groupon, Twitter, Apple, Salesforce.
If you're interested, sign for an invite and ping me when you do. I can help get things moving for you. Be well. :)