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Mail transferring process (sends and retrieves)
There are several steps of mail sending process：
To send the mails to MTA via MUA：The user has to make the following settings , when edit the
mails through MUA ：
1. The sender mail address and sender mail server (The sender send the mails to MTA via
MUA.)
2. The recipient mail address and recipient mail server (The recipient MTA which receive the
mails from the external mail server.)
The user use the MUA (For example, outlook express) to send the mails to assigned MTA.
If the mail server is the MTA itself , then it will send the received mails to recipient account
mailbox via MDA
The MTA use mail relay to send the mails ：The MTA use the mail relay to send the mails if the
recipient account is not existed in MTA.
The remote MTA received the mails from local MTA：The Remote MTA received the mails from
Local MTA, and then sends the mails to remote user via MDA. User can download these mails
as login MUA.
The process of users receive the mails：
Remote user can check if there are the mails in remote user mailbox via MDA .If there are the mails
existed, and then remote MTA will send mails to user's MUA. According to the MUA Setting, MUA can delete
or remain the mails.（As the user use the MUA to receive the mails again, and then the remained mail will be
downloading again. ）
CS-2000 UTM Content Security Gateway User's Manual
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