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I'm trying to finish up my Nagios install by having it email me. It was emailing me using /bin/mail so it always got sent to my spam folders. I installed sSMTP to try to send a request to my work's email server to be able to send out a message from an authenticated user.

Here is my /etc/ssmtp/ssmtp.conf file:

mailhub=10.200.120.148:25
UseTLS=NO
AuthUser= [email protected]
AuthPass=PASSWORD

So far I've been using the following command, and it will still arrive to my email inbox as root@localhost which causes it to go to my spam folder (with the exception of one email provider I have).

cat message |ssmtp [email protected]

I've looked at a few examples online, and they all seem to have pretty much the same as me. Does anybody see the any mistakes that I'm making?

Just to clarify, [email protected] is a user on the mail server that my work uses.

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  • also you have to revision your firewall ports and remember that to allow to the port like 25
    – amroesam
    Jul 7, 2012 at 3:05
  • Your title and body seem to disagree... is the mail being sent but marked as spam, or not getting sent? Some logs would be nice to see.
    – womble ♦
    Jul 7, 2012 at 4:50
  • Just for documentation, the problem was that the conf file was incorrect so the external SMTP server was receiving the request, but was sending it from the wrong email address ([email protected] instead of [email protected] which is a valid/created email address on the server) Conf file fix posted below
    – OrangeGrover
    Jul 9, 2012 at 16:17

2 Answers 2

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I'd start with sending a message while running tcpdump -A port 25 and watching the SMTP conversation.

If the remote mail system says the message is queued then sSMTP is working fine, and you'll have to look at the remote mail server. If it doesn't say it's queued, then try to fix whatever it says is wrong.

If you don't see any connections, only then is the problem is with sSMTP.

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  • Thanks, the server was acknowledging the receipt of the email, but still sending as the wrong address, so the problem was in the conf file.
    – OrangeGrover
    Jul 9, 2012 at 16:15
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Okay, I was able to get it to work, so here is some documentation for others who may have had a similar problem:

Here is the vim /etc/ssmtp/ssmtp.conf file:

# Email address the mail is sent from (account created on the SMTP server)   
[email protected]

# IP-address of the mail server
mailhub=10.200.120.148:25

# Domain of the mail server
RewriteDomain=domain.com

# Local machine's name
Hostname=nagios.localdomain

FromLineOverride=YES
UseTLS=NO

# Email account and password 
[email protected]
AuthPass=password

In order to use this, I run the following command: (Make sure not to put spaces after the \n in the below command)

echo -e "To: [email protected]\nFrom: [email protected]\nSubject: Nagios Notification\n\n Hello, this is a test"|ssmtp [email protected]

This results in the my gmail account recieving the email sent from [email protected] and not ending up in the Spam folder.

Thanks all for your help

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