On Fri, 2006-07-07 at 10:52 -0400, Steve Campbell wrote: > They are in /etc/hosts. Sendmail does not use /etc/hosts normally, I > believe, and that is why an address in sendmail DBs need the square brackets > around IPs, etc. > > Steve
Sendmail uses whatever address resolution mechanisms you have setup on the host (nsswitch.conf). The [ad.dr.es.s] idiom tells sendmail not to do MX resolution on the host in brackets.
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