Send with miultiple domain SSL certificates in the new Postfix11.10.24

postmap -F hash:/etc/postfix/vmail_ssl.map

# Change /etc/postfix/main.cf

```
- smtpd_tls_cert_file = /etc/pki/dovecot/certs/dovecot.pem
- smtpd_tls_key_file = /etc/pki/dovecot/private/dovecot.pem

# provide the primary certificate for the server, to be used for outgoing connections (note the indentation)
+ smtpd_tls_chain_files =
+   /etc/letsencrypt/live/mail.yourprimarymailserverdomain.com/privkey.pem,
+   /etc/letsencrypt/live/mail.yourprimarymailserverdomain.com/fullchain.pem

# provide the map to be used when SNI support is enabled
+   tls_server_sni_maps = hash:/etc/postfix/vmail_ssl.map
```

## Create file /etc/postfix/vmail_ssl.map
```
# One host per line - /etc/postfix/vmail_ssl.map
+ mail.yourprimarymailserverdomain.com /etc/letsencrypt/live/mail.yourprimarymailserverdomain.com/privkey.pem /etc/letsencrypt/live/mail.yourprimarymailserverdomain.com/fullchain.pem
+ mail.yoursecondarymailserverdomain.com /etc/letsencrypt/live/mail.yoursecondarymailserverdomain.com/privkey.pem /etc/letsencrypt/live/mail.yoursecondarymailserverdomain.com/fullchain.pem
# add more domains with keys and certs as needed
```

## Compile this file and restart
```
postmap -F hash:/etc/postfix/vmail_ssl.map
systemctl restart postfix
```

## Testing
```
openssl s_client -connect localhost:25 -servername mail.mydomainname.com -starttls smtp
```

https://medium.com/better-coder/postfix-multiple-domain-ssl-certificates-89c9f186ed73

Anonymous

Send with miultiple domain SSL certificates in the new Postfix11.10.24

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