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lang-bash
fifth.example.comandsixth.example.comare not email addresses, they're domain names. And it would be wrong to just change the first.to an@because that would break on things like<last.first.example.com>([email protected]). and changing the second last.to@would also be wrong because it would break on domains likefifth.example.com.au([email protected]). These would be valid addresses, but probably not addresses belonging to the users in the input. Anyway, the point is that any such assumption you make is likely to be wrong in at least some cases.