How to store mail in my computer when downloading by email client? [closed]

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In my project "email client"When i download mail can i save mail by xml? or othe开发者_StackOverflow社区rs type? which is better?

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Regardless of whether you use SMTP, POP or IMAP, the electronic mail is transferred in text format defined by RFC-5322.

A simple solution would be to store the emails as individual text files. If you use the .eml extension, many email clients (Outlook Express, Mozilla Thunderbird, &c.) will recognise these files and will be able to open them without further processing.