Mail::SpamAssassin::Util::RegistrarBoundaries − domain delegation rules


($hostname, $domain) = split_domain ($fqdn)

Cut a fully-qualified hostname into the hostname part and the domain part, splitting at the DNS registry boundary.


    "" => ( "www", "" )
    "" => ( "www", "" )

$domain = trim_domain($fqdn)

Cut a fully-qualified hostname into the hostname part and the domain part, returning just the domain.


    "" => ""
    "" => ""

$ok = is_domain_valid($dom)

Return 1 if the domain is valid, "undef" otherwise. A valid domain (a) does not contain whitespace, (b) contains at least one dot, and (c) uses a valid TLD or ccTLD.

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