sudo hostnamectl set-hostname example.comsudo apt install mailutils postfix-
- Choose "internet site", and type your domain (example.com)
mail [email protected] -s "Subject"- You should receive a mail from
[email protected]
sudo apt install certbotsudo certbot certonly --standalone --rsa-key-size 4096 --agree-tos --preferred-challenges http -d example.com-
- You might need to kill your running webserver (port 80) to complete the challenge in standalone mode
sudo chown -R root:postfix /etc/letsencrypt/live/example.com
/etc/postfix/main.cf
# TLS parameters
smtpd_tls_cert_file=/etc/letsencrypt/live/example.com/fullchain.pem
smtpd_tls_key_file=/etc/letsencrypt/live/example.com/privkey.pem
smtp_use_tls=yes
- SPF:
v=spf1 ip4:<your_ipv4> ~all - DMARC:
v=DMARC1;p=none;pct=100;[email protected];sp=none;aspf=r;
- https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-dkim-with-postfix-on-debian-wheezy
- All the check-auth tests should pass (SPF, DKIM, DMARC)
- Uncomment submission's lines in
/etc/postfix/master.cf - change
smtpd_sasl_type=dovecotbysmtpd_sasl_type=cyrus - add
-o smtpd_sasl_security_options=noanonymous
sudo apt install sasl2-binsudo usermod -aG sasl postfix
-
/etc/default/saslauthd
-
START=yes
-
MECHANISMS="sasldb"
-
OPTIONS="-c -m /var/spool/postfix/var/run/saslauthd"
-
sudo systemctl restart saslauthd -
systemctl status saslauthd -
- Make sure it is running with the
/var/spoolarguments
- Make sure it is running with the
-
sudo saslpasswd2 -c -u example.com user -
- The user does not have to be the user you will send mail with, it is just credentials
-
sudo testsaslauthd -u user -p password -f /var/spool/postfix/var/run/saslauthd/mux -
- Add a space before the command to not keep this in your history
-
- Note the custom socket path, it is required
/etc/postfix/sasl/smtpd.conf
pwcheck_method: saslauthd
mech_list: PLAIN LOGIN
sudo postfix reload
- Use https://www.mail-tester.com/ to make sure everything is working properly
- Example code (TS) below, can be ran with
npx ts-node test.ts - Use real data to test your setup or SpamAssassin will not be happy
import nodemailer from "nodemailer";
const smtpEndpoint = "example.com";
const port = 587;
const senderAddress = "My name <[email protected]>";
const smtpUsername = "user";
const smtpPassword = "pass";
const transport = nodemailer.createTransport({
host: smtpEndpoint,
port: port,
secure: false,
auth: { user: smtpUsername, pass: smtpPassword },
});
transport.sendMail({
from: senderAddress,
to: 'your-mail-tester-addr',
subject: 'A real subject',
text: "A real body",
})/etc/postfix/main.cf
virtual_alias_maps = hash:/etc/postfix/virtual
/etc/postfix/virtual
@example.com debian
sudo postmap /etc/postfix/virtual
- https://sendersupport.olc.protection.outlook.com/snds/index.aspx
- Claim your IP with [email protected]
- Open your mail on the server with
mailand confirm IP's ownership
tail -f /var/log/mail.info-vin submission parameters (/etc/postfix/master.cf)