@haploc @jwildeboer @a_cubed Any particular tip to improve deliverability beyond standard SPF/DKIM/DMARC setup? I have been operating my own mail server since 2008(ish), and still my deliverability to GMail/Outlook/Yahoo is poor. I regularly check my IP is not blacklisted (and it's never been !), I'm registered to Google Postmaster tools, MS SNDS, etc ... but still my mails often end up classified as spam