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Clarification of square brackets in transport file please

From: Stephen Carter (stephenretnet.co.uk)
Date: Sun Oct 02 2005 - 06:54:11 CDT

I understand that using square brackets around a host name tells
postfix to not lookup the MX records for that host and simply use
the A record instead, however I don't understand then why I should
do the same when specifying an IP address. I would have thought
an IP address is specific enough.

Can someone explain this please?

Thanks,

SteveC