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Part VI:
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an access database to see if a client should be accepted or rejected The reject_rbl_client and reject_rhsbl_client parameters will reject clients from specified domains
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smtpd_client_restrictions = permit_mynetworks, \ reject_unknown_client, check_client_access, reject_maps_rbl
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The reject_rbl_client restriction rejects domain addresses according to a specified MAPS service The site can be an online site or a local one set up to provide the service The reject_rhsbl_client restriction rejects host addresses
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smtpd_client_restrictions = reject_rbl_client relaysmail-abuseorg
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To implement restrictions from an access file, you can use the hash directive and the name of the file
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smtpd_client_restrictions = hash:/etc/postfix/access
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The corresponding smtpd_sender_restrictions parameter works much the same way as its client counterpart but controls access from specific senders It has many of the same restrictions but adds reject_non_fqdn_sender, which will reject any mail header without a fully qualified domain name, and reject_sender_login_mismatch, which will require sender verification The reject_rhsbl_sender restriction rejects domain addresses according to a specified MAPS service The smtpd_recipient_restrictions parameter will restrict the recipients the server will accept mail for Restrictions include permit_auth_destination, which allows authorized messages, and reject_unauth_destination, which rejects unauthorized messages The check_recipient_access restriction checks local networks for a recipient address The reject_unknown_recipient_domain restriction rejects recipient addresses with no DNS entry The reject_rhsbl_recipient restriction rejects domain addresses according to a specified MAPS service You can further refine restrictions with parameters such as smtpd_helo_ restrictions, which requires a HELO command from a client Restriction parameters include reject_invalid_hostname, which checks for faulty syntax, reject_unknown_ hostname, for hosts with no DNS entry, and reject_non_fqdn_hostname for hosts whose names are not fully qualified The strict_rfc821_envelopes parameter will implement strict envelope protocol compliance
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Sendmail
Sendmail operates as a server to both receive and send mail messages Sendmail listens for any mail messages received from other hosts and addressed to users on the network hosts it serves and, at the same time, handles messages users are sending out to remote users, determining what hosts to send them to You can learn more about Sendmail at sendmailorg, including online documentation and current software packages The Sendmail newsgroup is compmailsendmail You can also obtain a commercial version from sendmailcom The domain name server for your network designates the host that runs the Sendmail server This is your mail host Messages are sent to this host, whose Sendmail server then sends the message to the appropriate user and its host In your domain name server configuration file, the mail host entry is specified with an MX entry To print the mail queue of messages for future delivery, you can use mailq (or sendmail -v -q) This runs Sendmail with instructions to print the mail queue
25:
Mail Servers
The Sendmail software package contains several utilities for managing your Sendmail server These include mailq, which displays the queue of outgoing messages; mailstats, which shows statistics on mail server use; hoststat, which provides the stats of remote hosts that have connected with the mail server; and praliases, which prints out the mail aliases listed in the /etc/aliases file Some utilities, like mailq and hoststat, simply invoke Sendmail with certain options Others, like mailstats and praliases, are separate programs Sendmail now maintains all configuration and database files in the /etc/mail directory Here you will find the Sendmail macro configuration file, sendmailmc, as well as several database files (see Table 25-2) Many have changed their names with the release of Sendmail 810 For example, the help file is now /etc/mail/helpfile instead of /etc/sendmailht Specialized files provide support for certain features such as access, which lets you control access by different hosts and networks to your mail server, and virtusertable, which lets you designate virtual hosts These files have both text and database versions The database version ends with the extension db and is the file actually used by Sendmail You make your entries in the text version and then effect the changes by generating a corresponding database version Database versions are generated using the makemap command with the hash option and a redirection operation for the text and database file For example, to deny access to a particular host, you place the appropriate entry for it in the /etc/mail/access file, editing the file using any text word processor Then, to generate the /etc/mail/accessdb version of the access file, you change to the /etc/mail directory and use the following command:
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