I would think so. I'm at a loss if telnet works and SMTP is turned on. SMTP is
dead simple, so if the port is open and the service in on on the remote host,
that should be all you need. Good luck.
Tim Lowell
Schneider Electric | 210-439-5914 (cell)
On Mar 29, 2016, at 5:47 PM, Duc M Do <duc@xxxxxxxxxx> wrote:
Tim,
I did try to telnet to port 25 of mailhost, and it responds as expected. My
take is that mailhost is on my side of the firewall, though.
I am told specifically to use the mailhost mail relay by our IT folks, so
it's more than reasonable to assume that it's allowed to send through the
firewall. Right?
Duc
On Tue, Mar 29, 2016 at 5:42 PM, Lowell, Tim <
Tim.Lowell@xxxxxxxxxxxxxxxxxxxxxx> wrote:
Duc,
Do you know for sure that the new firewall allows traffic through port 25?
Did you try telnet (relay server) 25 to see if the connection goes through?
Tim Lowell | Invensys, a Division of Schneider Electric | United
States | Principal Project Application Engineer
Phone: +1 713 329 8437 | Cell: +1 210 439 5914
Email: tim.lowell@xxxxxxxxxxxxxxxxxxxxxx | Site:
www.schneider-electric.com | Address: 10900 Equity Drive, 77041
Houston (Equity Drive), Texas, United States
*** Please consider the environment before printing this e-mail
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Duc M Do
Sent: Tuesday, March 29, 2016 4:36 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Send mail from Solaris through firewall
​List,
I've spent a good part of three days banging my head against the
(fire)wall on this issue. Please help me before the blood soaks everything.
The situation: AW-D running Solaris 2.5.1 and sendmail 8.6, you know the
ancient version on the stock Sun boxes. I configured /etc/mail/sendmail.cf
years ago to send mail from this Sun box to the corporate e-mail and it's
been working all these years. Recently, we moved all these Sun boxes to
behind a fortified firewall, so fortified that even with a known relay mail
server, I have not been able to send mail to my desktop.
Previously, these are the only edits in my sendmail.cf (with
sendmail.cf.orig being the plain vanilla, stock sendmail.cf that came
with the software install), and it worked splendidly to send system status
reports to my corporate e-mail account:
04AW01# cd /etc/mail
04AW01# diff sendmail.cf.orig sendmail.cf
21c21
< Dj$w.$m
---
Dj04AW01.dowcorning.net27,28c27,28
< DRmailhost
< CRmailhost
---
DR
CR
I searched the freelists.org archive and found an excellent write up by
Sven Audenaert (thanks, Sven!) from Sept 2006 (
//www.freelists.org/post/foxboro/foxboro-Sendmail-error,2).
Following Sven's procedure, I added the mail relay in the hosts file, also
calling it "mailhost", and edited sendmail.cf accordingly. But that's
where my progress stopped.
Here's what I try to accomplish:
04AW01 ---> mailhost ---> smtp.dowcorning.net
originating relay server SMTP server destination
My new sendmail.cf (with sendmail.cf.orig being the plain vanilla, stock
sendmail.cf that came with the software install):
04AW01# diff sendmail.cf.orig sendmail.cf
21c21
< Dj$w.$m
---
Dj04AW01.dowcorning.net24c24
< DMether
---
DMmailhost
The most relevant part of sendmail.cf:
# my official hostname
Dj04AW01.dowcorning.net
# major relay mailer
DMmailhost
# major relay host
DRmailhost
CRmailhost
Yes, I stopped and started the sendmail daemon as needed after editing
sendmail.cf
When I try to run the test as in Sven's procedure, sendmail just hangs and
times out after 3 minutes or so.
Question: How do I specify the relay host in sendmail.cf to allow me to
send mail through it to the corporate mail server?
Thanks in advance for all the help. And I really need all the help at this
point.
Duc
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