Jan 11, · Undelivered Mail Returned to Sender This is the mail system at host xbook.info I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can. How to edit Undelivered Mail Returned to Sender on zimbra. How to add spam filters on zimbra How to create auto Bcc for sender mails for Zimbra The below command to login as zimbra user. To check bounce_template_file. To copy xbook.infot to xbook.info # Do not edit this file. I can now telnet to port 25 on this server and send an email by issuing the SMTP commands. I ran a test to a gmail account and received the email message ok. But on the same linux host I installed mail (apt-get mailutils) and ran this command: mail -s "test email" [email protected] Introduction to Linux - A Hands on Guide This guide was created Reputation: 0. Question Undelivered Mail Returned to Sender - Block Email For further assistance, please send mail to If you do so, please. Subject: Undelivered Mail Returned to Sender BODY: This is the mail system at host xbook.info I'm sorry to have to inform you that. Linux/BSD distribution name and version: Related log if You can delete your own text from the attached returned message. The mail system.