---
name: "Mail::MIMEDefang::Net"
section: "3"
platform: "linux"
package: "mimedefang"
version: "3.6-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Mail::MIMEDefang::Net"
---

# Mail::MIMEDefang::Net(3)

Network related methods for email filters

## NAME

Mail::MIMEDefang::Net - Network related methods for email filters

## DESCRIPTION

Mail::MIMEDefang::Net are a set of methods that can be called from *mimedefang-filter* to call network related services.

## METHODS

- expand\_ipv6\_address

  Method that returns an IPv6 address with all zero fields explicitly expanded, any field shorter than 4 hex digits will be padded with zeros.

- reverse\_ip\_address\_for\_rbl

  Method that returns the ip address in the appropriately-reversed format used for RBL lookups.

- relay\_is\_blacklisted

  Method that returns the result of the lookup (eg 127.0.0.2). Parameters are the ip address of the relay host and the domain of the rbl server.

- email\_is\_blacklisted

  Method that returns the result of the lookup (eg 127.0.0.2). Parameters are an email address, the domain of the hashbl server, and the type of hashing (MD5 or SHA1).

- is\_public\_ip4\_address $ip\_addr

  Returns true if `$ip_addr` is a publicly-routable IPv4 address, false otherwise

- is\_public\_ip6\_address $ip\_addr

  Returns true if `$ip_addr` is a publicly-routable IPv6 address, false otherwise

- get\_mx\_ip\_addresses $domain \[$resolver\_object\]

  Get IP addresses of all MX hosts for given domain.  If there are no MX hosts, then return A records.

- md\_get\_bogus\_mx\_hosts $domain

  Returns a list of "bogus" IP addresses that are in `$domain`'s list of MX records.  A "bogus" IP address is loopback/private/multicast/etc.

- get\_ptr\_record $ip\_address \[$resolver\_object\]

  Get PTR record for given IP address.

- relay\_is\_blacklisted\_multi

  Method that rerurns a hash table with one entry per original domain. Entries in hash will be: `"{ $domain =<gt"` `$return` }\>, where `$return` is one of SERVFAIL, NXDOMAIN or a list of IP addresses as a dotted-quad.

- relay\_is\_blacklisted\_multi\_count

  Method that returns a number indicating how many RBLs the host was blacklisted in.

- relay\_is\_blacklisted\_multi\_list

  Method that returns an array indicating the domains in which the relay is blacklisted.