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Well, I'm giving up on the DKIM certificate stuff. I disable the opendkim service. I read somewhere where Google likes to see 1024 bit DKIM keys, rather than 2048, so I tried creating new ones and implementing them, but when I tried to test the keys, opendkim was saying they couldn't be found. I then removed the new ones and used the original ones, but opendkim was still telling me those couldn't be found. I tried removing the original ones (that previously passed the tests) and recreating them, but the same thing. If I left it this way, it made it so mail wasn't sending. When I looked in my maillog, it flagged an issue with the dkim, so I just disabled it. The maillog was saying:
I did get Google support to respond to a ticket. They're suggesting things I've already tried. One of them was to put MX records in my DNS settings that point to the G Suite mail servers. I had already done that in my Clear Center account, but after you made me aware of an issue with that (I wasn't receiving emails using Kopano), I removed those MX records. I don't know how using G Suite MX records would work anyway, since my COS box uses my ClearCenter domain of renncoautomation.us. It's not a Google domain.
I might put the MX records back now, since I really don't use the incoming mail server on my COS box, but doing that in the past didn't keep 'sent mail' out of the gmail recipient's spam folder. -