How to ensure exactly once processing in Kafka for older version 0.10.0

Question

I have a scenario where I need to call an api to the notification service which will send an email to the user. Based on the message that appears to the topic I need to consume and call an api.
But if the consumer fails in between due to the nature of the at-least once configuration of the consumer its hard to avoid duplicate processing.
Sorry for newbie question. I Tried to find the many blogs but most of them are using newer version of Kafka but in our infra they are still using older version. Wondering how can we achieve this behavior?
Links that I referred earlier : If exactly-once semantics are impossible, what theoretical constraint is Kafka relaxing?

I also saw there documentation where they mention to store the processing result and offset to the same storage. But my scenario is api call lets imagine if the consumer call api and dies in between before committing offset then next poll will get that message and call api. In this way email will be sent twice.

Any help is appreciated.