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<DIV>Thanks for the comments. Bob, before your message, I tried smtp trace 5 and
got a nice trace. I found an e-mail to a gmail address first tried a gmail
address and failed. Then it found a mail server from an ISP that is a parent to
my ISP and it accepted the mail. I’ll pursue Michael’s suggestion of a dedicated
mail server at my location or in the area so I can be certain of where mail is
handled.</DIV>
<DIV> </DIV>
<DIV>Jerry, N0MR</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=bobtenty@gmail.com
href="mailto:bobtenty@gmail.com">Boudewijn (Bob) Tenty</A> </DIV>
<DIV><B>Sent:</B> Monday, July 28, 2014 4:29 PM</DIV>
<DIV><B>To:</B> <A title=nos-bbs@tapr.org href="mailto:nos-bbs@tapr.org">TAPR
xNOS Mailing List</A> </DIV>
<DIV><B>Subject:</B> Re: [nos-bbs] SMTP gateway</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'><PRE style="WORD-WRAP: break-word; FONT-VARIANT: normal; WHITE-SPACE: pre-wrap; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: normal; COLOR: rgb(0,0,0); FONT-STYLE: normal; LETTER-SPACING: normal; LINE-HEIGHT: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px">From the jnos manual...
smtp trace [<value>]
Displays or sets the trace flag in the SMTP client, allowing you to watch SMTP's
conversations as it delivers mail. Zero (the default) disables tracing. A trace
value of 1 just enables the "new mail for n5knx from <A class=moz-txt-link-rfc2396E href="mailto:k5arh@w5ddl.ampr.org">mailto:k5arh@w5ddl.ampr.org</A>".
Larger values produce more voluminous trace output.
</PRE>73,<BR><BR>Bob VE3TOK<BR><BR class=Apple-interchange-newline>
<DIV class=moz-cite-prefix>On 14-07-28 01:53 PM, Lakenet wrote:<BR></DIV>
<BLOCKQUOTE cite=mid:065DC6DAF2C146F58762BB5F4F06DCBA@JerryPC
type="cite">Michael, <BR><BR>Thank you for the note. I failed to mention that
my Linux JNOS machine is located behind a Netscreen NS5GT firewall that blocks
all but trusted incoming mail on port 25. That blocks the thousands of spam
mails that would otherwise come in daily. Is there any trace or other
parameter that I can set in JNOS to monitor outgoing SMTP traffic so I can see
how and where outgoing SMTP traffic is going? I'm not a network person so I
learn by lots of reading and trial and error. I will look into a mail server
that I can run on the Linux machine and I have a couple of mentors that can
help. <BR><BR>Jerry, N0MR <BR><BR>-----Original Message----- From: Michael E
Fox - N6MEF <BR>Sent: Monday, July 28, 2014 12:13 PM <BR>To: 'TAPR xNOS
Mailing List' <BR>Subject: Re: [nos-bbs] SMTP gateway <BR><BR>JNOS already
uses SMTP so it doesn't require a gateway. But ... <BR><BR>-- The SMTP
code in JNOS is very old and I've seen it do a couple things <BR>(like
pipelining when that option has not been negotiated) that aren't quite
<BR>correct by today's standards <BR>-- The SMTP code in JNOS has no security
mechanisms <BR><BR>So, if you are sending SMTP messages to or receiving SMTP
messages from any <BR>other machine that you don't trust 100% (this includes
anything on the <BR>Internet and probably the rest of 44-net) then you should
configure 'smtp <BR>gateway' to the address of a mail server you do trust.
<BR><BR>For example, here is one way to do it: Each of the linux
machines that runs <BR>JNOS in our network is also running a mail
server. JNOS is configured with <BR>'smtp gateway' set to the linux IP
address. The linux mail server <BR>configuration performs a dozen
or more security checks on incoming mail <BR>connections from other machines,
including: DNS lookups, blacklist lookups, <BR>relay lookups,
network-based lookups, spam detection, virus scanning, and <BR>more. It
also performs some outbound checks to make sure JNOS has not be
<BR>compromised. If your mail server is exposed to the Internet and you
monitor <BR>the mail logs on such a machine, you'll find that it will be hit
with relay <BR>or spam or virus attempts multiple times per hour. But
the gateway rejects <BR>all of that (hopefully!), protecting the JNOS system.
<BR><BR>Some home/SOHO routers may have something simple built into their
software <BR>which lets them protect you from some attacks. Consult
you're router's <BR>documentation for details. Perhaps Google or Yahoo
or others provide a free <BR>service. Postini (now part of Google, ugh!)
and others provide paid <BR>services. For details on how to set up your
own, more comprehensive <BR>solution, consult the documentation for your
preferred mail server software: <BR>sendmail, postfix, exim, ...
<BR><BR>Finally, the JNOS release notes provide some details about extra 'smtp
<BR>gateway' options that were added a few versions ago. <BR><BR>Michael
<BR>N6MEF <BR><BR><BR>-----Original Message----- <BR>From: <A
class=moz-txt-link-abbreviated
href="mailto:nos-bbs-bounces@tapr.org">nos-bbs-bounces@tapr.org</A> [<A
class=moz-txt-link-freetext
href="mailto:nos-bbs-bounces@tapr.org">mailto:nos-bbs-bounces@tapr.org</A>] On
Behalf <BR>Of Lakenet <BR>Sent: Monday, July 28, 2014 9:12 AM <BR>To: TAPR
xNOS Mailing List <BR>Subject: [nos-bbs] SMTP gateway <BR><BR>I have always
set SMTP gateway to none not knowing how to use that gateway. <BR>Recently I
read a reflector post that the gateway should be set to the <BR>address of the
home router I assume to route unroutable mail out into the <BR>internet. I
understand that any packet mail with no route to deliver would <BR>go to the
SMTP queue. So I entered a gmail address from within JNOS for a <BR>test and
the mail did get to the recipient. I did not see anything on the <BR>monitor.
How does this operation run? Does ampernet have some type of mail <BR>handler?
Does anyone know if there is something written to explain this <BR>operation
or can someone type me a simple explanation. <BR><BR>Thank you, <BR><BR>Jerry,
N0MR <BR><BR><BR>_______________________________________________ <BR>nos-bbs
mailing list <BR><A class=moz-txt-link-abbreviated
href="mailto:nos-bbs@tapr.org">nos-bbs@tapr.org</A> <BR><A
class=moz-txt-link-freetext
href="http://www.tapr.org/mailman/listinfo/nos-bbs">http://www.tapr.org/mailman/listinfo/nos-bbs</A>
<BR><BR>_______________________________________________ <BR>nos-bbs mailing
list <BR><A class=moz-txt-link-abbreviated
href="mailto:nos-bbs@tapr.org">nos-bbs@tapr.org</A> <BR><A
class=moz-txt-link-freetext
href="http://www.tapr.org/mailman/listinfo/nos-bbs">http://www.tapr.org/mailman/listinfo/nos-bbs</A>
<BR></BLOCKQUOTE><BR>
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