linux sendmail 配置发送外部邮件（redhat6）

1. 创建 sendmail证书

cd /etc/ssl/certs/
make sendmail.pem

2 .添加authinfo
在/etc/mail/access 中添加

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”

生成数据库

makemap -r hash /etc/mail/access.db < /etc/mail/access

3.配置smarthost
编辑 /etc/mail/sendmail.mc
在MAILER前添加

FEATURE(`authinfo',`hash /etc/mail/access.db')dnl

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

写入到sendmail.cf中

m4 sendmail.mc > sendmail.cf

4.重启sendmail服务

service sendmail restart

参考地址：
http://appgirl.net/blog/2009/configuring-sendmail-to-relay-through-gmail-smtp/

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