Avoid receiving spam : senderscore filter
Senderscore keeps a database of mail server reputation.
Havin a moderate reputation doesn't mean much, but having a bad one means the server already has sent spams before.
You can use a filter in smtpd to recognize as spam incoming mails according to senderscore.
Install opensmtpd-filter-senderscore port.
Then, edit /etc/mail/smtpd.conf to add a filter :
filter senderscore \ proc-exec "filter-senderscore -junkBelow 70 -slowFactor 2000" ... listen on all tls pki athome.tld filter { senderscore }