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By private I think the communication via E-Mail is the quickest contact reason.1. be performed 24 hours a day, such as if you want to contact the owner of the business or customers, but could not be contacted by telephone, it can contact via email.2. can contact each other freely around the world. Without additional charge, contact between the countries.3. There are no other costs, such as transportation costs, operation, documentation.4. easy to use with multiple people at the same time. No need to waste time in sending messages to many people know. Can once sent to many recipients at all.5. be able to browse the information at any time.6. data is not lost from falling during operation, or if the error can be corrected immediately.For the reason above. The use of E-Mail communication is therefore considered both the quickest and most convenient in my comment.

Personally, I think that communicating via E-Mail to contact the quickest. The reason for
one. Can be operated 24 hours a day, if you want to contact the business owner or the customer can not be contacted by telephone. You can contact me via email
two. Can freely around the world. Without additional cost to the international contacts
3. No other expenses such as travel costs to implement the document
4. The easy to use interface with many people at one time. No need to send the same message to several people in mind. Can be sent to multiple recipients at once, not
five. Data can be retrieved at any time
six. Data is not lost Missing the action If the information is wrong, it can be resolved immediately
above reasons, the use of E-Mail communication is considered a way that's easy. And the fastest in my opinion.