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The <Communigate> sub-element in the <Vrfy> element defines connections to the Communigate Administrative Command Line Interface (CLI), which normally listens on TCP port 106. Using the Communigate verifier is usually the most efficient way to interact with a Communigate server. Communigate is currently the only verifier type to take advantage of parallel enumeration, in which a large number of verification servers share the work of enumerating the email address on the server.
It is important to note that many Communigate servers close TCP connections when too many connections are attempted. It is easy to overwhelm the Communigate server default connection limit (5). Coupled with a long <Timeout> setting, the result can appear as an application malfunction. For this reason, the default <BackendMax> element of Communigate verifiers is quite small.
Some Communigate installations can handle many hundreds of simultaneous connections. For such sites, enumeration can be completed in a reasonable amount of time by using parallel enumeration across a very large set of connections (100 to 200).
The <Communigate> sub-element requires the following elements:
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