[hobbit] Monitoring SMTP Relay server using hobbit

19 Dec 2009

      Balasubramaniam Natarajan schrieb:
...
Hi
I have two Windows 2003 server which works as SMTP relay server.
What are the key parameter of the server should I monitor from Xymon.
I want to check certain parameters like

If the Mail server is accepting mails.
If the Mail Server is able to relay it to the next server.
Is my Mail relaying server free from open relaying and stuffs,

How could I achieve all these using Xymon?  I have BBNT "An NT/W2K
**CLIENT** for Big Brother System & Network Monitor Version 1.08d" on
all the Windows 2003 servers.
Hi,
for 1 and 3 you can use a server-side script using expect:
file expect-smtp
###################
#!/usr/bin/expect
set mailserver [lrange $argv 0 0]
set from [lrange $argv 1 1]
set to [lrange $argv 2 2]
set timeout 90
spawn telnet $mailserver 25
expect "failed" {
send_user "$mailserver: connect failed\n"
exit
} "2?? *" {
} "4?? *"   {
exit
} "refused" {
send_user "$mailserver: connect refused\n"
exit
} "closed" {
send_user "$mailserver: connect closed\n"
exit
} timeout {
send_user "$mailserver: connect to port 25 timeout\n"
exit
}
send "HELO server.isp.de\r"
expect "2?? *" {
} "5?? *" {
send_user "=== $mailserver: HELO 5??\n"
exit
} "4?? *" {
send_user "=== $mailserver: HELO 4??\n"
exit
}
send "MAIL FROM: <$from>\r"
expect "2?? *"  {
} "5?? *" {
exit
} "4?? *" {
exit
}
send "RCPT TO: <$to>\r"
expect "2?? *" {
set smtpcode "2xx"
send_user "smtpcode = $smtpcode\n"
} "5?? *" {
set smtpcode "5xx"
send_user "smtpcode = $smtpcode\n"
exit
} "4?? *" {
set smtpcode "4xx"
send_user "smtpcode = $smtpcode\n"
exit
}
send "RSET\r"
send "QUIT\r"
exit
#########################
I call it from server-side shell-script mailserver-verify.sh
for a list of mailservers.
(in my case: check rejecting invalid recipients during the SMTP protocol)...
...
TEXT=$(${BBHOME}/ext/expect-smtp ${IP} verify at isp.de
non-existent-address@${DOMAIN})
...
220 server03.domain.de Microsoft ESMTP MAIL Service, Version: 6.0.3790.3959 ready at  Sat, 19 Dec 2009 14:57:09 +0100
HELO relay.isp.de
250 server03.domain.de Hello [10.224.138.110]
MAIL FROM: verify at isp.de
250 2.1.0 verify at isp.de....Sender OK
RCPT TO: non-existent-address at domain.de
550 5.1.1 User unknown
smtpcode = 5xx
... evaluate the line "smtpcode =" in ${TEXT},
and sent a message to xymon-server.
Regards,
Alex

[hobbit] Monitoring SMTP Relay server using hobbit

alex＠bakarasse.de