<human>:  What are the key features of a good email marketing campaign?
<bot>: The key features of a good email marketing campaign include having a clear and concise subject line, including a personal touch, properly segmenting your email list, having links to relevant content, utilizing A/B testing, incorporating an effective call-to-action, and keeping mobile users in mind. Additionally, having an automated response plan, measuring signature metrics and analytics, avoiding spam filters, and utilizing email personalization techniques are all important components of a successful email marketing campaign.