Question: I'm looking for an email client that can translate and summarize long email threads and attachments, do you know of any?

One of the top choices is MailMaestro, an email management and productivity tool powered by OpenAI. MailMaestro offers AI-generated email writing, translation, and summarization of email threads and attachments. It also includes features like meeting request detection, text shortcuts, and magic templates, and works seamlessly with Outlook and Gmail. Available for download on Windows, Mac, and web versions, it's designed to boost productivity and communication with robust security measures.

Another excellent option is ChatGPT Writer, which provides a wide range of AI-powered features including email writing, grammar checking, translation, and summarization. It supports all languages and integrates deeply with Gmail, making it a versatile tool for enhancing your email workflow. With various pricing tiers, including a free option, it's accessible for different needs and budgets.

For a more streamlined approach, SimpleMail offers features like Summarize, which condenses long emails into notes with a single click. It’s available as a free, open beta Chrome extension for Gmail, with plans to expand to other email services and mobile apps. SimpleMail aims to automate email writing tasks, thereby boosting productivity and efficiency.