Postfix Enable SSL/TLS with your certificate

Create Cert & Key:


openssl req -new -x509 -nodes -days 1530 -out server.crt -keyout server.key
mkdir /etc/mailssl
chmod 700 /etc/mailssl
cp server.* /etc/mailssl


Postfix SSL config

Edit /etc/postfix/main.cf:

#SSL stuff
smtpd_tls_cert_file = /etc/mailssl/server.crt
smtpd_tls_key_file = /etc/mailssl/server.key


To make smtps work on port 465 which it should, then you have to edit /etc/postfix/master.cf:

Uncomment the following near the top (note it is the stanza which starts with smtps and NOT smtp)

smtps     inet  n       -       n       -       -       smtpd
  -o smtpd_tls_wrappermode=yes
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_client_restrictions=permit_sasl_authenticated,reject

The above didn't work,I had to comment the two lines about sasl_auth and client_restrictons to make it work.

smtps     inet  n       -       n       -       -       smtpd
  -o smtpd_enforce_tls=yes
  -o smtpd_tls_wrappermode=yes
#  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
 


Tags:

postfix, enable, ssl, tls, certificatecreate, cert, openssl, req, nodes, server, crt, keyout, mkdir, etc, mailssl, chmod, cp, config, edit, cf, smtpd_tls_cert_file, smtpd_tls_key_file, smtps, uncomment, stanza, smtp, inet, smtpd, smtpd_tls_wrappermode, smtpd_sasl_auth_enable, smtpd_client_restrictions, permit_sasl_authenticated, reject, didn, sasl_auth, client_restrictons, smtpd_enforce_tls,

Latest Articles

  • ImageMagick Convert PDF Not Authorized
  • ImageMagick Converted PDF to JPEG some files have a black background solution
  • Linux Mint Mate Customize the Lock screen messages and hide username and real name
  • Ubuntu/Gnome/Mint/Centos How To Take a partial screenshot
  • ssh how to verify your host key / avoid MIM attacks
  • Cisco IP Phone CP-8845 8800/8900 Series How To Reset To Factory Settings Instructions
  • ls how to list ONLY directories
  • How to encrypt your SSH private key file id_rsa
  • Linux Mint 18 Disable User Name List from showing on Login Screen
  • Firefox Cannot Hit Enter Key In Address Bar and Location History Not Working
  • Cisco Unified Communications Manager / CUCM IP 8.6,10,12 Install Error Solution
  • Ubuntu Debian Mint Linux SSHD OpenSSH Server Not Starting After Reboot Solution
  • nmap how to scan for all ports and not just the 1000 most common ports
  • Windows 7,8,10 and Server 2008, 2012, 2016, 2019 Read Only Attribute Won't Go Away
  • bind / named how to make a wildcard record and retain defined A records
  • Cisco Unified Communications Manager 12 Install Errors on Proxmox/KVM
  • Local Vs Universally Administered MAC Address NIC Refuses to come up
  • Cisco Unified Communications Manager 12 CUCM 12 - How To Enable Video Calling
  • Windows 7, 8, 10, Windows Server 2008, 2012, 2016, 2019 How To AC97 Audio Drivers and Other Unsigned Drivers
  • Cisco Unified Communications Manager / CUCM IP Telephony Definitions