A sendmail problem that has not been solved so far

Source: Internet
Author: User
A sendmail problem that has not been solved yet-general Linux technology-Linux technology and application information. The following is a detailed description. The company conducted a test email server, the Company domain name hqhop.com. The original mailbox domain name mail.hqhop.com. Test the server domain name test.hqhop.com. Add hqhop.com and test.hqhop.com. To the local-host, send emails to qq. 163 and so on, the original mailbox can also be sent to the test mailbox, but if test sends the original mailbox, the error 550. user unknow will be prompted. Why?
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