1. Install prerequisites
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yum install sendmail mailutils sendmail-bin |
2. Create Gmail Authentication file
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mkdir -m 700 /etc/mail/authinfo/ cd /etc/mail/authinfo/ |
nano gmail-auth
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AuthInfo: "U:root" "I:YOUR GMAIL EMAIL ADDRESS" "P:YOUR PASSWORD" |
Replace the above email with your gmail or google apps email.
In the next step we will need to create a hash map for the above authentication file:
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makemap hash gmail-auth < gmail-auth |
3. Configure your sendmail
Put bellow lines into your sendmail.mc configuration file right above first «MAILER» definition line:
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define(`SMART_HOST',`[smtp.gmail.com]')dnl define(`RELAY_MAILER_ARGS', `TCP $h 587')dnl define(`ESMTP_MAILER_ARGS', `TCP $h 587')dnl define(`confAUTH_OPTIONS', `A p')dnl TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl FEATURE(`authinfo',`hash -o /etc/mail/authinfo/gmail-auth.db')dnl |
Do not put the above lines on the top of your sendmail.mc configuration file !
In the next step we will need to re-build sendmail’s configuration. To do that execute:
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make -C /etc/mail |
Reload sendmail service:
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/etc/init.d/sendmail reload |
and you are done.
4. Configuration test
Now you can send an email from your command line using mail command:
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$ echo "Just testing my sendmail gmail relay" | mail -s "Sendmail gmail Relay" my-email@my-domain.com |
If you will experience substitutional delays after executing the above command to most likely cause is that you have not configured your host with FQDN. Check your logs for a warning: