Configure Linux Sendmail to send external mail (redhat6)

1. Create a Sendmail Certificate

 
CD/etc/SSL/certs/MakeSendmail. pem
 

2. Add authinfo to/etc/mail/access.

 
Authinfo: smtp.gmail.com "u: Root" I: User@gmail.com "P: Password" M: Plain "authinfo: smtp.gmail.com:587"U: Root" "I: User@gmail.com" "P: Password" "M: Plain"
 

Generate Database

 
Makemap-r hash/etc/mail/access. DB </etc/mail/Access
 

 

3. Configure smarthost to edit/etc/mail/sendmail. MC and add

Feature ('authinfo '  , 'Hash/etc/mail/access. DB  '  ) Dnldefine ('smart _ host '  , 'Smtp .gmail.com  '  ) Dnldefine ('relay _ mailer_args  '  , 'Tcp $ H 587  '  ) Define ('esmtp _ mailer_args  '  , 'Tcp $ H 587  '  ) Define ('cert _ DIR  '  , '/Etc/SSL/certs  '  ) Define ('confcacert _ path '  , 'Cert _ DIR  '  ) Define ('confcacert  '  , 'Cert _ DIR/ca-bundle.crt  '  ) Define ('confcrl  '  , 'Cert _ DIR/ca-bundle.crt  '  ) Define ('confserver _ Cert  '  , 'Cert _ DIR/sendmail. pem  '  ) Define ('confserver _ key '  , 'Cert _ DIR/sendmail. pem  '  ) Define ('confclient _ Cert  '  , 'Cert _ DIR/sendmail. pem  '  ) Define ('confclient _ key  '  , 'Cert _ DIR/sendmail. pem  '  ) Define ('confauth _ mechanisms  '  , 'External gssapi DIGEST-MD5 CRAM-MD5 login Plain  ' ) Trust_auth_mech ('external Digest -MD5 CRAM-MD5 login Plain '  ) 

Write to sendmail. cf

 
M4 sendmail. MC> sendmail. cf
 

 

4. Restart the sendmail service.

 
Service Sendmail restart
 

Reference address:

Http://appgirl.net/blog/2009/configuring-sendmail-to-relay-through-gmail-smtp/

Http://tech.bluesmoon.info/2008/03/gmail-smtp-with-sendmail.html