Quote:
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Dec 23 01:12:32 25612-21212 postfix/smtpd[4023]: warning: 27.105.1.210: hostname 27-105-1-210-adsl-TPE.dynamic.so-net.net.tw verification failed: Name or service not known
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Do you have valid nameservers in /etc/resolv.conf?
Where is your server located? In a data center, or maybe on a DSL line with a dynamic IP?