Q. I get following error message for my postfix email server:
Mail Delivery Failed With DNS Service Unavailable Error and Solution
How do I fix this problem?
A. You need to setup full qualified domain name (FQDN) using dns server to avoid this error message. The remote mail server receiving the mail from the local server is unable to resolve the local mail server’s hostname. For example, if you set local mail server name to lansmpt.example.com, make sure it can be queried using DNS and have a valid working fully qualified domain name.
🐧 Get the latest tutorials on Linux, Open Source & DevOps via RSS feed or Weekly email newsletter.
🐧 0 comments... add one ↓
🐧 0 comments... add one ↓
Related Tutorials
| Category | List of Unix and Linux commands |
|---|---|
| File Management | cat |
| Firewall | Alpine Awall • CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04 |
| Network Utilities | dig • host • ip • nmap |
| OpenVPN | CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04 |
| Package Manager | apk • apt |
| Processes Management | bg • chroot • cron • disown • fg • jobs • killall • kill • pidof • pstree • pwdx • time |
| Searching | grep • whereis • which |
| User Information | groups • id • lastcomm • last • lid/libuser-lid • logname • members • users • whoami • who • w |
| WireGuard VPN | Alpine • CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04 |
