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Old 22nd February 2011, 16:13
falko falko is offline
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Actually, localhost = 127.0.0.1. The difference is that if you use a hostname, Postfix will try to connect to MySQL through the MySQL socket (which does not work if Postfix is running chrooted), whereas if you use an IP, Postfix will try to connect to MySQL through a TCP connection (which works even if Postfix is running chrooted).
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