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E-Mail Instructions and Set-up Overview Sending Clients Outlook Express Eudora Light Preston Company maintains a closed-relay system for all outgoing mail, which means that only authorized clients can send mail through our mail servers. While this system ensures the highest quality of mail service possible, it requires all clients to do the following when sending mail: Check for new e-mail on any POP3 account before sending outgoing mail. Send any outgoing e-mail within 30 minutes of checking for new e-mail.