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The next example rejects any message from larisa@turtlemycarcom and sends a notice of the rejection:
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Description Accepts message even if other rules would reject (exception to the rules) Discards the message completely Rejects the message, sending a rejection notice to the sender Relays messages for specified domain Code and message to be sent to sender
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You can also specify an error message to return, as shown here:
cecelia@rabbitmytrekcom ERROR:"Retired yesterday"
To send an error message to spammers, you can include a message as shown here The first number is an error code:
cyberspammercom ERROR:"550 We don't accept mail from spammers"
An /etc/mail/access file with the previous entries looks like the following:
myannoyingadcom larisa@turtlemycarcom cecelia@rabbitmytrekcom cyberspammercom DISCARD REJECT ERROR:"Retired yesterday" ERROR:"550 We don't accept mail from spammers"
Sendmail reads the access rules from a database file called accessdb, also located in the /etc/mail directory To implement your rules, you have to regenerate the accessdb file using the access file You can do this with the make command using access as the argument, as shown here:
make access
Sendmail then has to be restarted to read the new accessdb file The access file is enabled in the sendmailmc file with the access_db feature:
The access file will deny mail received from the listed addresses However, you can also reject any mail sent to them Additionally, you can also received mail for certain hosts on your network You do this by enabling the blacklist_recipients option in the sendmail mc file This option governs recipients, whereas access normally governs senders Those addresses listed will not be able to receive any mail This feature is also used for certain administrative users that should never receive mail, such as nobody (the guest user) or ftp (the FTP user):
The following example will not allow mail to be sent to cyberspammercom (a recipient), nor can mail be received for justin@lizardmytrekcom, secretproject@rabbit mytrekcom, or mysurfboardcom:
mysurfboardcom justin@lizardmytrekcom secretproject@rabbitmytrekcom cyberspammercom ERROR:"Domain does not exist" "Moved to Hawaii" REJECT REJECT
Your distribution version of smbconf may configure Sendmail to use access_db (as is the case with Fedora) Access is granted only to users on the localhost If your system is being used as a mail server for a network and you have not enabled the relay_entire_domain feature, you will need to allow access by other hosts on your network In the access file, you can place a RELAY rule for your network The RELAY rule will let other hosts use your mail
Part VI:
Internet and Network Services
server to send messages out to other hosts This is normally done for a gateway host that needs to relay messages from a local network out to the Internet The following example allows access from the mytrekcom network:
mytrekcom RELAY
For a specific host, place an entry for it in the access file as shown here:
rabbitmytrekcom RELAY
To further secure Sendmail, you should disable the use of VRFY This option allows remote users to try to verify the existence of a user address This can be used to guess valid users on your system This option is disabled with the noverify feature:
Another potential security breach is the EXPN option, which expands mailing lists and aliases to their actual addresses Use the noexpn feature to turn it off:
By default, Sendmail will refuse mail from any domain that cannot be resolved You can override this restriction with the accept_unresolvable_domains feature Sendmail will also reject mail whose addresses do not have fully qualified domain names You can override this feature with accept_unqualified_senders
POP and IMAP Server: Dovecot
The protocols Internet Mail Access Protocol (IMAP) and Post Office Protocol (POP) allow a remote server to hold mail for users who can then fetch their mail from it when they are ready Unlike procmail, which delivers mail messages directly to a user account on a Linux system, the IMAP and POP protocols hold mail until a user accesses an account on the IMAP or POP server The servers then transfer any received messages to the user s local mailbox Such servers are often used by ISPs to provide Internet mail services for users Instead of being sent directly to a user s machine, the mail resides in the IMAP or POP server until it s retrieved Red Hat Linux and Fedora install Dovecot as both its IMAP and POP servers Other popular IMAP and POP servers available are Qpopper, the Qmail POP server, the Washington University POP and IMAP servers, and the Courier POP and IMAP servers You can access the POP server from different hosts; however, when you do, all the messages are transferred to that host They are not kept on the POP server (though you can set an option to keep them) The POP server simply forwards your messages to the requesting host When you access your messages from a certain computer, they will be transferred to that computer and erased from the POP server If you access your POP server again from a different computer, those previous messages will be gone The Internet Mail Access Protocol (IMAP) allows a remote server to hold mail for users who can then log in to access their mail Unlike the POP servers, IMAP servers retain user mail messages Users can even save their mail on the IMAP mail server This has the advantage of keeping a user s mail in one centralized location accessible anywhere on
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