Question: I need a customizable webmail client that supports mobile devices and has a user-friendly interface.

If you want a customizable webmail client that works on mobile devices and has a clean interface, IceWarp is a good option. This all-in-one business suite includes hosted email, team chat, video and audio conferencing, document management and cloud storage. The interface is highly customizable, and it can be deployed in cloud or self-hosted configurations. It's available through web, desktop and mobile interfaces, so it's a good option for business communications.

Another good option is Mailbird, which is geared for people with multiple email accounts. It's got a clean interface that's customizable for personal and professional use. Mailbird supports integrations with services like Google Calendar and Dropbox, and has AI-powered email composition and advanced email signatures. It works on multiple devices and has a range of pricing options, including a free version.

For an AI-powered email management tool, Shortwave has a lot to offer to help you get a handle on your inbox. It includes AI-generated full emails, predictive autocomplete suggestions and customizable tabs for important emails. Shortwave also lets you schedule sends and track read status, so it's good for people who want to automate their email workflow. It's available in a range of pricing tiers, so it's good for personal and professional use.

Last, Canary is an AI-powered email app that tries to make your email life easier. It's got AI Copilot for drafting and responding to emails, a unified inbox and tools for bulk cleaning and scheduling emails. Canary also has strong security features and a range of pricing tiers for students, professionals and enterprise teams.