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^..crmxc..\.comcast\.net
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########################################################################
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### FILE: /etc/greylistd/whitelist-hosts
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### PURPOSE: List of hosts from which we do not want to greylist mail
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########################################################################
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### This file is not actually read by greylistd, but is normally referenced
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### from the Mail Transport Agent (MTA) that invokes greylistd. As such,
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### the format of the entries is MTA-dependent.
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### Most MTAs support at least the following:
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### - A single IPv4 address, consisting of 4 octets (0-255): 192.168.0.1
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### - Between one and three octets, indicating an IPv4 network: 192.168.0
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### - A single host name: gluck.debian.org
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### - Wildcards in a host name: *.debian.org
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### Exim 4 supports much more elaborate syntax, including regular expressions
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### starting with "^" (e.g.: ^..crm[hx]c..\.comcast\.net), IP addresses with
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### netmasks (10.0.0.0/8, 10.0.0.0/255.0.0.0), etc. For full detail, refer to
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### section 10.8 in the Exim 4 "spec.txt" file.
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### If you use host names in this list, beware that lookup failures will
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### cause your MTA to temporarily reject the mail - indefinitely. For that
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### reason, it is generally better to use IP addresses than host names.
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#^..crm[hx]c..\.comcast\.net