Several tools can assist in maintaining your email list effectively: 1. Email Verification Services: Tools like ZeroBounce and NeverBounce help verify the validity of email addresses. 2. Email Marketing Platforms: Platforms like Mailchimp, Constant Contact, and HubSpot offer list management and segmentation features. 3. CRM Systems: Customer Relationship Management (CRM) systems like Salesforce and Zoho CRM can help you manage and segment your email list. 4. Analytics Tools: Use analytics tools to track engagement metrics and identify areas for improvement. 5. Automation Tools: Automation tools can help you send re-engagement campaigns and automate list cleaning processes.