Postfix Configure Client SMTP Authentication ( Smarthost Authentication )
last updated in Categories CentOS, Debian / Ubuntu, EMail Servers, Fedora Linux, Linux, Networking, RedHat and Friends, Solaris-Unix, Suse, Troubleshooting, Ubuntu Linux, UNIXMy ISP requires that mail from my dynamic IP to our small business email addresses uses their outgoing SMTP servers. This is probably done to reduce abuse and spam but now I’m not able to send email and local Postfix log file displays authentication failure message. How do I relay mail through my mail ISP servers using Postfix SMTP under Linux / UNIX like operating systems?