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When I happened to notice, courier-mta was spewing out a lot of errors. In fact, it was receiving mail, but apparently it wasn’t able to send any. The error was:
Address family not supported by protocol
Hmm, I thought it might be something related to IPv6, but it turned out that /etc/resolv.conf simply wasn’t written correctly. Specifically,
nameserver 127.0.0.1
Even though it had to be specified like that, for some crazy reason I had written localhost instead. orz