Postfix & Dovecot configuration on Debian 10

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root@mailsrv:~# apt install postfix sasl2-bin dovecot-core dovecot-pop3d dovecot-imapd

Choose:
Internet site / No configuration

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root@mailsrv:~# vim /etc/postfix/main.cf

// for ipv4 only please set:

mynetworks = 127.0.0.0/8

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