Which of the following is a common feature of email marketing platforms?

Email marketing platforms are legally and ethically required to include an unsubscribe option in every email. This ensures compliance with regulations like GDPR and CAN-SPAM, giving recipients control over the communications they receive. Without this feature, emails could be considered spam, leading to deliverability issues and reputational damage. Personalised, custom templates are a common feature, but not a universal, mandatory one like the unsubscribe option. A free list of email addresses is never provided by legitimate email marketing platforms; acquiring email lists through non-consensual means is illegal and unethical.