2 FAQ tagged "access_file"

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Postfix blacklist or reject an email address
Q. I’ve Postfix based CentOS Linux server. I need to blacklist email ID: user@abadboy.com . How do I blacklist email address with postfix? I also have spamassassin software installed.
A. By default, the Postfix SMTP server accepts any sender address. However you can block / blacklist sender email address easily with Postfix. [...]
How Linux file permissions work
Linux (and almost all other Unixish systems) have three user classes as follows:

User (u): The owner of file
Group (g): Other user who are in group (to access files)
Other (o): Everyone else

You can setup following mode on each files. In a Linux and UNIX set of permissions is called as mode:

Read (r) [...]

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