Dunno, I pay Linode $10 a month, haven't had problems. Have a few friends and family that send and receive a fair amount of email. I've talked to a fair numbe

Dunno, I pay Linode $10 a month, haven't had problems. Have a few friends and family that send and receive a fair amount of email. I've talked to a fair number of other mail server owners, doesn't seem like a big deal. I've definitely had more problems with university mail servers getting blacklisted than my personal mail server. I have noticed problems that fit well with some mail servers considering the age of your domain name. Sure SPF, DKIM, DMAC, and friends require some work, but so does mysql (which I use for domain, users, forwarding, and similar tables), postfix, sieve, etc.