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Thanks for giving it a look! Enforcing DMARC and strict SPF tend to screw up mailing lists and forwarding. I don't see how I can enable them without causing a lot of other problems for me and my users.

No arguments about my provider. Any tips on how to select a better one? I'm thinking someone who adds some friction to unblocking outbound port 25, e.g. Vultr, might be better.

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DMARC shouldn't be an issue for mailing lists, as long as one of DKIM/SPF passes. Are you seeing reports of both DKIM and SPF failing for mailing lists you use?

Properly configured mailing lists shouldn't modify contents of emails causing DKIM to fail.

I personally use Linode and would recommend them. But basically any tier 1/2 provider, i.e. too big/popular to block, will do. However, I would avoid DigitalOcean per my experience due to them completely blocking SMTP on IPv6 in addition to badly implemented IPv6 support and seemingly subpar support.

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