The engine() method has been available in the Sisimai class since Sisimai v4.16.0. As shown in the sample code below, this method provides a function to return a list of the names and descriptions of all implemented MTA modules.

Sisimai->engine()

#!/usr/bin/env perl
require Sisimai;
my $v = Sisimai->engine;
print keys %$v;         # 73
for my $e ( keys %$v ) {
    print $e;           # Sisimai::Lhost::Exchange2007
    print $v->{ $e };   # Microsoft Exchange Server 2007
}
                

Sisimai.engine()

#!/usr/bin/env ruby
require 'sisimai'
v = Sisimai.engine
puts v.keys.size;  # 73
v.keys.each do |e|
  puts e    # Sisimai::Lhost::Exchange2007
  puts v[e] # Microsoft Exchange Server 2007
end