Scenario: hypno.cat expanded inside a Raspberry Pi 4 with Arch Linux, three breeds (domains), two virtual users and one local user.
- Raspberry Pi 4 Model B Rev 1.2 with 4 GB RAM and 64 GB SD Card - Arch Linux ARM armv7l with kernel 5.4.50-1-ARCH - OpenSMTPD 6.7.1p1-4, Dovecot 2.3.10.1-1 and Rspamd 2.5-2 - three domains [ birman.com persian.com siamese.com ] - same two virtual users on each domain [ daddy mommy ] - one ip address [ a.b.c.d ] - one local user [ user ] DNS records: birman.com A a.b.c.d birman.com MX 10 mail.birman.com birman.com TXT "v=spf1 mx -all" _dmarc birman.com TXT "v=DMARC1;p=none;pct=100;rua=mailto:postmaster@ birman.com;" 20200713._domainkey birman.com TXT "v=DKIM1;k=rsa;p=MIG...QAB;" mail birman.com A a.b.c.d * same for persian.com and siamese.com with respective changes in domain name Created a local user to manage the six virtual mailboxes. $ sudo useradd -m -c "Virtual Mail" -d /var/mail/vmail -s /sbin/nologin vmail I got the certificates with LetsEncrypt. $ sudo certbot --nginx --agree-tos --no-eff-email --redirect --hsts --staple-ocsp --email personal.em...@gmail.com -d mail.birman.com Generate keys for DKIM. $ sudo mkdir /etc/smtpd/dkim $ sudo openssl genrsa -out /etc/smtpd/dkim/birman.com.key 1024 $ sudo openssl rsa -in /etc/smtpd/dkim/birman.com.key -pubout \ -out /etc/smtpd/dkim/birman.com.pub $ sudo chown -R rspamd:rspamd /etc/smtpd/dkim * same for persian.com and siamese.com with respective changes in domain name In this learning setup will exist six virtual mailboxes and three email addresses delivering to the local user “user” (u...@birman.com, u...@persian.com and u...@siamese.com). Under /home/user/Maildir will be mail sent for u...@birman.com, u...@persian.com and u...@siamese.com. At /var/mail/vmail will exist three directories (birman.com, persian.com and siamese.com) and below each of these directories will exist two directories (daddy and mommy) which in turn will have the Maildir directory to store mail. Also I would like OpenSMTPD to use the respective domain/certificate when receiving or sending mail (based on the domain of the user receiving or sending). I can get all “parts” ready to work but cannot create the appropriate files to OpenSMTPD and Dovecot make this scenario work. If this scenario is possible and someone with more knowledge could provide the configuration for smtpd.conf and dovecot.conf I would be grateful. It has been two weeks trying to understand/consolidate several pieces of information from the Internet without success. Also I find other problems on the way. First I tried with Manjaro ARM (64-bit). Could not get rspamd to start. Then I tried Ubuntu 20.04. Some packages aren’t available. Tried to put OpenBSD or FreeBSD on Raspberry, can’t either. Get all “parts” ready on Arch Linux. I’m learning a lot, but some help now would be great! Thanks!
