If email is used, it is essential to ensure that the exchange of emails is properly documented in the file. This should be done by sending the result of the consultation to the applicant for information with no time limit. This ensures that the exchange is included in the public part of the file and that the applicant is aware of this.
Submissions filed by email during a consultation or during oral proceedings held as a videoconference, including all attachments, should be annexed to the minutes (see E‑III, 8.5.2, for details).
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/c_vii_3_3.htm
Date retrieved: 17 May 2021