In practice it probably doesn't matter that much.
They will very often not be personal data of the applicant even if the content of the email contains pd and accordingly outside the scope of the SAR. So you can redact them. Technically it would breach DP principles if you did not as no legal basis for disclosure if they are not the applicants PD. Sometimes they will be PD of the applicant and the other person in which case they should not be redacted as there would be no reason to.
On the other hand they are unlikely to be confidential and the applicant already knows them (assuming they were a recipient/ sender) so any breach by just leaving it all in would usually be trivial.
Its one reason why I prefer not to routinely copy 'all' emails but to actively extract the (usually quite small amounts of ) PD from them.
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