一个用于解析电子邮件的Ruby库是Mail：

Mail is an internet library for Ruby that is designed to handle emails
generation,parsing and sending in a simple,rubyesque manner.

[…] Mail has been designed with a very simple object oriented
system that really opens up the email messages you are parsing,if you
know what you are doing,you can fiddle with every last bit of your
email directly.

以下是访问电子邮件内容的示例：

mail = Mail.read('/path/to/message.eml')

mail.envelope.from   #=> 'mikel@test.lindsaar.net'
mail.from.addresses  #=> ['mikel@test.lindsaar.net','ada@test.lindsaar.net']
mail.sender.address  #=> 'mikel@test.lindsaar.net'
mail.to              #=> 'bob@test.lindsaar.net'
mail.cc              #=> 'sam@test.lindsaar.net'
mail.subject         #=> "This is the subject"
mail.date.to_s       #=> '21 Nov 1997 09:55:06 -0600'
mail.message_id      #=> '<4D6AA7EB.6490534@xxx.xxx>'
mail.body.decoded    #=> 'This is the body of the email...

它还使您能够解析多部分电子邮件,以及测试和提取附件.