Email subscriber

An email subscriber is a user who has explicitly opted in to receive email messages from a particular sender. Subscribers are added to mailing lists through methods like form signups, app permissions, or checkout flows. 

Maintaining a healthy subscriber base is essential to: 

• Protect sender reputation 
• Improve deliverability and engagement 
• Stay compliant with Mailgun’s Acceptable Use Policy 

Best practices for managing subscribers include: 

• Using confirmed (double) opt-in to verify interest and reduce spam complaints 
• Sending welcome emails to set expectations 
• Segmenting lists to send relevant content 
• Regularly cleaning inactive or bouncing addresses 

Mailgun strongly discourages adding users without consent, purchasing lists, or reusing stale data – these practices harm deliverability and violate anti-spam policies.