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550 5.7.1 Client does not have permissions to send as this sender

When configuring the receive connector in Exchange 2007,  I find out that users using SMTP email client like Outlook Express and Thunderbird can receive email but cannot sent email through Exchange as the SMTP server. They get the following error:

“Protocol: SMTP, Server Response: ‘550 5.7.1 Client does not have permissions to send as this sender’, Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC78”

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Frequently Used Zimbra CLI

The Zimbra administration console is usually used as the mail tool for configuring and maintaining Zimbra.  But actually, some Zimbra function can only be changed using the Command Line Interface (CLI) utility. More »

Zimbra antivirus not started

This morning (12 Feb 08) my colleague told me that there is a problem with our client’s mail server. All users canoot received emails. This company use Zimbra CS. The POP3 and SMTP service was running. Later on, we checked that all emails are deffered. Those mail are deffered because of the antivirus service are stop processing all those emails. More »