I used to run my own mail server for ~7 years and never had issues. I used DKIM, SPF, etc and still do although they're problematic with mailing lists... Postf

I used to run my own mail server for ~7 years and never had issues. I used DKIM, SPF, etc and still do although they're problematic with mailing lists... Postfix before, openSMTPd the last few years.