in reply to Turning a comma-delimited list of internal email addresses into a space-delimited list of internet email addys?

Maybe: 
my $distlist = join ' ', map { "$_\@myorg.mydomain" } @emaillist;

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Or if you want to transform the original array at the same time: 
my $distlist = join ' ', map { $_ = "$_\@myorg.mydomain" } @emaillist;

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