Training per sysadmin

Prima di tutto si deve verificare se si raggiunge il sistema remoto. Si può fare con il programma `ping <nome host o indirizzo IP>`

Il ping può essere utile per verificare anche la latenza di rete

TODO Costin

TODO Costin

TODO Costin

Da non leggere se non si è già amministratori di un server email.

In order to have a working SMTP server we have to take care of “some” ;) points:

• PTR reverse DNS record: dig +short ptr <reverse IP>.in-addr.arpa must give an hostname which DNS A record points to the <IP address> of your server.
• DNS:
  • MX → who exchange the mail for the domain?
  • SPF → which addresses can be originated from the MX?
  • DKIM → how are signed messages outgoing from the MX?
  • DMARC → what actions do you suggest to mail receivers' providers regarding the conf of SPF/DKIM and where you would like to receive reports from them to tune your mail settings?

• Furthermore we need working antispam and antivirus
• And of course SMTP server only relay local or TLS + authenticated connections
• Need to add DNS entries to the host that receives DMARC reports if domain is different from the one of the DMARC itself

• https://wiki.zimbra.com/wiki/Best_Practices_on_Email_Protection:_SPF,_DKIM_and_DMARC
• https://workaround.org/ispmail/jessie
• https://workaround.org/ispmail/wheezy/smtpd-restrictions-spf-dkim-and-greylisting
• DKIM on STMP RELAY server (trust hosts…) http://www.stevejenkins.com/blog/2011/08/installing-opendkim-rpm-via-yum-with-postfix-or-sendmail-for-rhel-centos-fedora/

• Very useful thread for MS hotmail and outlook problems https://www.hmailserver.com/forum/viewtopic.php?t=27930

• Fantastic and happy! http://www.mail-tester.com/web-us64b
• MX Toolbox non ha bisogno di presentazioni, molti test: https://mxtoolbox.com/
• Documentazione DNS MailCow: https://mailcow.github.io/mailcow-dockerized-docs/prerequisite-dns/
• SPF: http://tools.wordtothewise.com/spf/check/
• SPF, DKIM, Antispam: http://dkimvalidator.com send an email to the given address and view results
• DMARC: https://dmarcian.com/
• IMAPs: http://wiki.dovecot.org/TestInstallation
• SMTP: https://www.ndchost.com/wiki/mail/test-smtp-auth-telnet
• SMTPs: https://www.saotn.org/tls-test-smtp-auth-plain-authentication-and-verify-starttls-connections/

1. [X] Backup e aggiornamento Mailcow
2. [X] Configurazione Mailcow → aggiungere dominio
3. [X] Creare un utente admin specifico per il dominio
4. [X] Trasferire alias (copia da /etc/postfix/virtual_pdp)
5. [X] Visualizzare tutte le impostazioni necessarie del DNS e si aggiornano i record DNS
6. [X] Effettuare il test: tra tutti mail-tester e mxtoolbox

cd /opt/mailcow-dockerized
helper-scripts/backup_and_restore.sh backup all
./upgrade.sh
./upgrade.sh

Per il changelog v. canale Telegram, oppure git log