We are sending email communication to the customers already present in 'All Subscribers'. We intend to use the same Subscriber Key but may send to different email address. The requirement is that the Email address in 'All Subscribers' for that subscriber should not be updated. We are sending via Journey Builder. Is there any work around for this?
When configuring your Email Send activity in JB, you can select the expected behaviour in context of All Subscribers list. This option is however only available in the recently introduced Transactional Journeys:
You do it in Activity Summary > Delivery Options. Once you set it to "Only add new subscribers", then the email address connected to an existing Subscriber Key will not be updated.
Unfortunately, in the regular journeys, this setting is not available, and it is not possible to avoid updating All Subscribers in regular journeys.