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Unix - SMTP relay

Posted on 2013-06-07
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Last Modified: 2013-06-24
I need to write script to look at the Linux Servers in question to see if SMTP relay is on for port 25.

I have a list of servers need to run this script. Can some one please assist.
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Question by:ittechlab
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Author Comment

by:ittechlab
ID: 39228997
where do i check if i have SMTP relay configured in any linux server.

I am using all redhat 4/5/6
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LVL 20

Assisted Solution

by:carlmd
carlmd earned 167 total points
ID: 39229600
Go to www.mxtoolbox.com, enter your domain, and use "mx lookup", then use SMTP Test on the result.

That should tell you everything you need to know.
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LVL 27

Assisted Solution

by:skullnobrains
skullnobrains earned 166 total points
ID: 39231199
this should get you started with

cat <<EOF | nc -w 10 HOST 25 | grep "550.*access.*denied"
mail from: <>
rcpt to: toto@example.com
EOF

this will return true if you end up with a "relay access denied" while sending a mail from the empty user to a remote domain and false in all other cases including the server being down or failure of the script

you can easily stick this in a loop if you have many machines to check

beware that relay access will differ depending on the location of the machine on which you run the script
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LVL 13

Accepted Solution

by:
Sandy earned 167 total points
ID: 39234719
create a for loop which accepts input(servername) listed in separate file and then put below commands and redirect all the stdin and stderr in a file

#netstat -lnp | grep 25
#alternatives --display mta

Cheers
SA
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