https://www.abclinuxu.cz/poradna/linux/show/412325
postfix, amavis, spamassasin
postfixamavisspamassasin
https://www.earth.li/mailman3/hyperkitty/list/main@lists.alug.org.uk/thread/2HUD5GNHGBSZYZCYELSPBWRBJN6ZZWUH/
Sendmail, Milter, Spamassasin and Sophpos. - main - earth.li
sendmailmilterspamassasinmainearth