@disroot in the past few years the email space has grown incredibly hostile towards small and independent mail hosts, even when they comply with antispam measures like having well configured servers (no open relay), PTR, SPF, DKIM, DMARC, mail filtering, etc.
Most of the trouble comes from Microsoft, who has become dominant in the mail hosting business and defaults to either sending to junk or rejecting email from servers who are not ISPs, Gmail, Yahoo or MS
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