有ip和域名怎么搭建邮箱

sudo apt update
sudo apt install postfix dovecot-imapd dovecot-pop3d

sudo nano /etc/postfix/main.cf

myhostname = mail.yourdomain.com
mydomain = yourdomain.com
myorigin = $mydomain
inet_interfaces = all
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
home_mailbox = Maildir/
smtpd_tls_cert_file = /etc/letsencrypt/live/yourdomain.com/fullchain.pem
smtpd_tls_key_file = /etc/letsencrypt/live/yourdomain.com/privkey.pem
smtpd_use_tls = yes
smtpd_tls_security_level = may
smtpd_tls_protocols = !SSLv2, !SSLv3, TLSv1, TLSv1.1, TLSv1.2
smtpd_tls_ciphers = high
smtpd_tls_eecdh_grade = strong

sudo nano /etc/dovecot/dovecot.conf

mail_location = maildir:~/Maildir
protocols = imap pop3
ssl = yes
ssl_cert = </etc/letsencrypt/live/yourdomain.com/fullchain.pem
ssl_key = </etc/letsencrypt/live/yourdomain.com/privkey.pem

sudo systemctl start postfix
sudo systemctl enable postfix
sudo systemctl start dovecot
sudo systemctl enable dovecot

yourdomain.com.  IN  MX  10  mail.yourdomain.com.