Use a IP locking solution instead, where the 2FA solution is used to approve IPs for the account instead.
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Från: The Doctor <doctor@doctor.nl2k.ab.ca>
Datum: 2020-08-24 14:07 (GMT+01:00)
Till: dovecot@dovecot.org
Ämne: 2 factor authentication
Is 2 factor authentication possible on dovecot?