OpenSMTPD + Dovecot email server

Installation For OpenBSD (opensmtpd should be installed by default):&#xA;pkg_add opensmtpd-filter-rspamd rspamd dovecot For Arch Linux:&#xA;pacman -S opensmtpd opensmtpd-filter-rspamd rspamd dovecot For Debian Linux:&#xA;apt install opensmtpd opensmtpd-filter-rspamd rspamd dovecot-imapd dovecot-lmtpd Prerequisites Open ports 25 (SMTP), 465 (submission) and 993 (IMAPS). Port 25 will be used by…