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Pozri si pastnem ti z postfix dokumentacie: Sender address restrictions The smtpd_sender_restrictions parameter restricts what sender addresses this system accepts in MAIL FROM commands.

By default, this restriction is applied when the client sends the RCPT TO command. In order to have the restriction take effect as soon as possible, specify smtpd_delay_reject = no in the Postfix main.cf configuration file. Doing so may cause unexpected results with poorly implemented client software.

Default: smtpd_sender_restrictions =

By default, the Postfix SMTP server accepts any sender address.

Syntax: Specify a list of zero or more restrictions, separated by whitespace or commas. Restrictions are applied in the order as specified; the first restriction that matches wins.

In addition to restrictions that are specific to sender mail addresses, you can also specify restrictions based on the information passed with the HELO/EHLO command , on the client hostname or network address , or on the recipient address . The recipient restrictions take effect only if smtpd_delay_reject = yes so that all restrictions are evaluated after the RCPT TO command.

Example: smtpd_sender_restrictions = hash:/etc/postfix/access, reject_unknown_sender_domain

Z toho jasne vyplyva,ze treba rozoznavat sender_restr recipient_restrict etc. ma to zmixovane. reject_unknown_sender_domain NEMOZE byt v recipientrestrictions napriklad.To nezoberie nikdy.