Which one is an extension of mime that supports secure mail communication?
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MIME stands for Multipurpose Internet Mail Extensions. It is used to extend the capabilities of Internet e-mail protocols such as SMTP. The MIME protocol allows the users to exchange various types of digital content such as pictures, audio, video, and various types of documents and files in the e-mail. MIME was created in 1991 by a computer scientist named Nathan Borenstein at a company called Bell Communications. Show
MIME is an e-mail extension protocol, i.e., it does not operate independently, but it helps to extend the capabilities of e-mail in collaboration with other protocols such as SMTP. Since MIME was able to transfer only text written file in a limited size English language with the help of the internet. At present, it is used by almost all e-mail related service companies such as Gmail, Yahoo-mail, Hotmail. Need of MIME ProtocolMIME protocol is used to transfer e-mail in the computer network for the following reasons:
MIME HeaderMIME adds five additional fields to the header portion of the actual e-mail to extend the properties of the simple email protocol. These fields are as follows:
1. MIME Version It defines the version of the MIME protocol. This header usually has a parameter value 1.0, indicating that the message is formatted using MIME. 2. Content Type It describes the type and subtype of information to be sent in the message. These messages can be of many types such as Text, Image, Audio, Video, and they also have many subtypes such that the subtype of the image can be png or jpeg. Similarly, the subtype of Video can be WEBM, MP4 etc. 3. Content Type Encoding In this field, it is told which method has been used to convert mail information into ASCII or Binary number, such as 7-bit encoding, 8-bit encoding, etc. 4. Content Id In this field, a unique "Content Id" number is appended to all email messages so that they can be uniquely identified. 5. Content description This field contains a brief description of the content within the email. This means that information about whatever is being sent in the mail is clearly in the "Content Description". This field also provides the information of name, creation date, and modification date of the file. Want to add a padlock to your email messages? You can use S/MIME in Outlook on the web to increase the security of messages. A digitally encrypted message can only be opened by recipients who have the correct key. A digital signature assures recipients that the message hasn’t been tampered with. Notes:
Which version of Outlook on the web am I using?IF YOUR MAILBOX LOOKS LIKE...  You're using the new Outlook on the web IF YOUR MAILBOX LOOKS LIKE... You're using classic Outlook on the web Install the S/MIME control
Allow the Outlook on the web domain to use the S/MIME control
Encrypt and digitally sign outgoing messagesHow do I encrypt or digitally sign all messages?After you’ve installed the S/MIME control, select
Note: All outgoing messages includes new messages, replies, and forwards. How do I encrypt individual messages?To add or remove digital encryption from an individual message that you’re composing:
If you encrypt an outgoing message and Outlook on the web can’t verify that all recipients can decrypt the message, you’ll see a notice warning you which recipients might not be able to read the encrypted message. You can then send the message anyway, remove those recipients, or retry to check again. How do I digitally sign individual messages?To add or remove a digital signature from a message that you’re composing:
If your certificate is stored on a smart card, you'll be prompted to insert the smart card to digitally sign the message. Your smart card may also require a PIN to access the certificate. Reading encrypted and digitally signed messagesHow do I read an encrypted message?A key icon If you normally use Conversation view, you'll have to open the message in a new window to read it. There will be a link on the message to make this easier. When you receive an encrypted message, Outlook on the web will check whether the S/MIME control is installed and whether there is a certificate available on your computer. If the S/MIME control is installed and there is a certificate available, the message will be decrypted when you open it. If your certificate is stored on a smart card, you'll be prompted to insert the smart card to read the message. Your smart card might also require a PIN to access the certificate. How do I verify the signature of a digitally signed message?A ribbon icon If you normally use Conversation view, you'll have to open the message in a new window to read it. Information about the digital signature will be at the top of the message, along with a link that you can select to learn more about the digital signature. What else do I need to know?
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