Configure Linux sendmail with GMAIL

Configure Linux sendmail with GMAIL

1.Backup /etc/mail/sendmail.mc and /etc/mail/sendmail.cf

2.Create certs dir in /etc/mail

3.Edit sendmail.mc

Add this lines

define(`CERT_DIR', `/etc/mail/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_OPTIONS', `A')dnl

define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl

TRUST_AUTH_MECH(`EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl

FEATURE(`authinfo', `Hash -o /etc/mail/authinfo')dnl

define(`SMART_HOST', `smtp.gmail.com')dnl

define(`RELAY_MAILER_ARGS', `TCP $h 587')

define(`ESMTP_MAILER_ARGS', `TCP $h 587')

Note: Sometime the quotes will not copy properly, check the quotes(two different quotes is there)

4. Create authinfo file in /etc/mail dir

#touch authinfo

5.Copy the following commands in the authinfo file ( Replace gmail username and password)

AuthInfo:smtp.gmail.com "U:root" "I:yourid@gmail.com" "P:" "M:LOGIN PLAIN"

AuthInfo:smtp.gmail.com:587 "U:root" "I:yourid@gmail.com" "P: " "M:LOGIN PLAIN"

6. Go to /etc/mail/certs dir

Run these following commands to create certificates ( give appropriate values )

#openssl req -new -x509 -keyout cakey.pem -out cacert.pem -days 3650
#openssl req -nodes -new -x509 -keyout sendmail.pem -out sendmail.pem -days 3650

7. Compile sendmail.mc file using following command

#m4 sendmail.mc > sendmail.cf

8. Restart sendmail Service

#service sendmail restart

9. Check whether mails are going

#mailx -s “Test Mail” mailid@gmail.com

Test message

.

CC .

Check the log file

#tail –f /var/log/maillog

Now we can able to use this smtp relay with other application

Note:

Give smtp server name as “ localhost “ and Port 25 . it will work with localhost name only.

In Oracle Applications - We can use this . In OAM workflow mailer configuration give outbound server name “localhost” .

Then you can receive workflow notification mails, alert mails and all Apps related mails.