HowtoForge provides user-friendly Linux tutorials.
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I cannot send and/or receive emails.
Author: till •
Tags: postfix, sendmail, ispconfig •
Comments: 0 Please check if Sendmail/Postfix and your POP3 daemon are running by executing netstat -tap You will get a list of all services listening on your server. If they are running re-configure your firewall (iptables or ipchains) so that the ports 25 (Sendmail/Postfix) and 110 (POP3) are not blocked. If this does not help please check that Sendmail/Postfix is really running on port 25 and your POP3 daemon on port 110. (Hint for standard RedHat installations: If you have webmin installed and are running Sendmail, go to Webmin->Servers->Sendmail->Sendmail Options. Under SMTP Port Options you often find the following entry:
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One of the users on the system has a CatchAll-email address. He receives all emails, even those for users of another site...
Author: till •
Tags: postfix, ispconfig •
Comments: 0 One of the users on the system has a CatchAll-email address. He receives all emails, even those intended for users of another site on the same server. The MTA on the server is postfix. Please check if the domain of the users that receives all emails is the same as the domain $mydomain in /etc/postfix/main.cf. If this is the case, change $mydomain and run postfix reload on the shell. You should never enter a domain that is used for a virtual site on the server as $mydomain in /etc/postfix/main.cf!
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What virus scanner is used by ISPConfig 2?
Author: till •
Tags: security, ispconfig •
Comments: 0 ISPConfig 2 uses ClamAV (http://www.clamav.net) as virus scanner and the E-mail Sanitizer (http://www.impsec.org/email-tools/procmail-security.html) as content filter.
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How do I configure Sendmail for SMTP-Auth?
Author: till •
Tags: sendmail •
Comments: 0 Some helpful links: http://www.sendmail.org/%7Eca/email/auth.html http://www.jonfullmer.com/smtpauth/ http://www.joreybump.com/code/howto/smtpauth.html http://server.1und1.com/root_server/bs/suse72/howtos/1.html http://info.ccone.at/INFO/Mail-Archives/redhat/Jan-2002/msg02936.html http://www.howtoforge.com/howto_sendmail_smtp_auth_tls
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Making snapshots of the process table shown by the TOP command
Author: till •
Tags: shell •
Comments: 0 To make a snapshot of the current process table, use the following command: top -n 1 -b > /tmp/processtable.txt You can now view the textfile with any text editor, e.g. pico or vi.
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Show all processes for a specific user
Author: till •
Tags: shell •
Comments: 4 To view only the processes owned by a specific user, use the following command: top -U [USERNAME] and replace [USERNAME] with the name of the user.
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Get a list of the installed services
Author: till •
Tags: shell •
Comments: 5 To get a list of the installed services on the shell, you may use this command (on Fedora, RedHat, CentOS, SuSE, and Mandriva): chkconfig --list
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Creating image borders with ImageMagick convert
Author: till •
Tags: shell •
Comments: 0 The command is: convert -border 2x2 old.jpg new.jpg This creates a new image (new.jpg) with a 2 pixel border from the image old.jpg. To set the bordercolor to red, use this command: convert -border 2x2 -bordercolor "#FF0000" old.jpg new.jpg
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How can I clear the shell window?
Author: till •
Tags: shell •
Comments: 1 Use the commad: clear or the keyboard shortcut: [CTRL] + [L]
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How to save a command in the shell history without executing it
Author: till •
Tags: shell •
Comments: 2 Enter the command line and hit the keys:[CTRL] + [#]This will put a # in front of the command and execute it. The shell will take it as comment.
