Question: I'm looking for a solution that can capture email addresses and physical addresses of website visitors for targeted marketing campaigns.

Opensend is a good option for e-commerce site operators and marketers. It captures email, physical address and device information so you can retarget in real time. Email retargeting, ads and postal targeting means you can build and expand your email list, re-engage customers and target corporate buyers. It's easy to set up, taking less than 5 minutes, and integrates with services like Shopify and Klaviyo.

Another more powerful option is Customers.ai, which can help you turn website visitors into customers by identifying them and remarketing to them. It offers features like a Website Visitor ID X-Ray Pixel, B2B & B2C Data Enrichment, Meta Ads Visitor Audience Sync and Advanced Audience Segmentation. It integrates with services like Meta, Klaviyo, Semrush, SendGrid and Salesforce to help you grow your email list and engage your audience with personalized content.

Justuno is an integrated marketing platform that personalizes your website to drive more sales and lower costs. It captures email and SMS addresses through advanced personalization and targeting features like segmentation and lead capture. With visitor intelligence technology, it creates detailed profiles of website visitors so you can send targeted messages and track behavior across multiple devices. Justuno integrates with more than 100 marketing technology systems and offers multiple pricing tiers depending on your business needs.