1.1 Install Sendmail
1.2 Configure Sendmail
1.2.1 Sendmail files:
/etc/mail: configuration files
/etc/mail/sendmail.mc: sendmail configuration file, m4 to sendmail.cf
/etc/mail/sendmail.cf: sendmail running using configuration file
/etc/mail/access: accessabled clients
/etc/mail/local-host-names: local host names.
/etcr/mail/domaintale:
/etc/mail/mailertable:
/usr/mail:
/var/spool :
/var/spool/mqueue: email queues
/var/log/maillog : running logs
/var/log/messages : running logs
1.2.2 Configue /etc/mail/sendmail.mc
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Sendmail macs defination : | |
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Divert(n) |
For m4 buffer, n=-1 :removed ; n=0 : new a buffer. |
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OSTYPE |
Using operate system |
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Domain |
Which domain for MTA |
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Feature |
A special functions |
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Define |
Define a special option |
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MASQUERADE_AS |
Other host names |
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MAILER |
Mail transfer type |
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dnl |
comments |
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In most Linux configuration files a # symbol is used at the beginning of a line convert it into a comment line or to deactivate any commands that may reside on that line.
The sendmail.mc file doesn't use this character for commenting, but instead uses the string "dnl". Here are some valid examples of comments used with the sendmail.mc configuration file:
These statements are disabled by dnl commenting.
modify these lines to:
…
TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
...
DAEMON_OPTIONS(`Port=smtp,Addr=0.0.0.0, Name=MTA')dnl
...
This configuration just allow smtp authentication for external domain relay only. If you also need to authentication for local domain, please modify it like this:
…
TRUST_AUTH_MECH(`DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
define(`confAUTH_MECHANISMS', ` GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
...
DAEMON_OPTIONS(`Port=smtp,Addr=0.0.0.0, Name=MTA,M=Ea')dnl
...
Allowed vrfy，expn commands：
# define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl
define(`confPRIVACY_FLAGS', `authwarnings')dnl
After modified, run this command to general the sendmail.cf:
[root@host mail]# m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
Then restart the sendmail, the new configuration will be using.
1.2.3 Configue /etc/mail/local-host-names
Added these lines in /etc/mail/local-host-names :
[root@host spool]# cat /etc/mail/local-host-names
# local-host-names - include all aliases for your machine here.
host.com
mail.host.com
1.3 Restart sendmail and test
Restart sendmail :
[root@host spool]# service sendmail restart
Shutting down sm-client: [ OK ]
Shutting down sendmail: [ OK ]
Starting sendmail: [ OK ]
Starting sm-client: [ OK ]
1.4 Running logs:
/var/log/maillog
/var/log/messages
