Barbara M.:
>
> How work name resolution in Postfix?
>
http://www.postfix.org/postconf.5.html#smtp_host_lookup
Wietse
smtp_host_lookup (default: dns)
What mechanisms the Postfix SMTP client uses to look up a host's
IP address. This parameter is ignored when DNS lookups are
disabled (see: disable_dns_lookups).
Specify one of the following:
dns
Hosts can be found in the DNS (preferred).
native
Use the native naming service only (nsswitch.conf, or
equivalent mechanism).
dns, native
Use the native service for hosts not found in the DNS.
This feature is available in Postfix 2.1 and later.
