Re: IBM i as email relay

Some new information on the IBM i SMTP relaying email. We tried Putty from
my Windows desktop last week and it didn't work, but it did work from the
IBM i itself. This was port 25.

I remembered it took a while before the IBM i responded with the "service
ready" message. So I did a telnet this morning, from the IBM i, and it
took almost 90 seconds for the message to appear. Hmmm. I wonder what
would happen if I did it from Windows with Putty and just waited? Sure
enough, after about 90 seconds, the service ready message popped up.

Now the question is why so long? If I telnet with port 23, the response is
almost instant.


On Wed, Aug 7, 2024 at 3:53 PM Rob Berendt <robertowenberendt@xxxxxxxxx>
wrote:

I believe Simon had the nicest, but most thorough, way of telling you to
RTFM.

On Wed, Aug 7, 2024 at 2:43 PM Peter Dow <petercdow@xxxxxxxxx> wrote:

Rich,

Good company when he was still alive:

Simon Coulter.
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On 8/7/2024 10:18 AM, Rich Loeber wrote:

Jeff,

"Fly by night"? Really?

Rich Loeber
Kisco Systems LLC
http://www.kisco.com

________________________________



On 8/7/2024 12:38 PM, Jeff Crosby wrote:

Good Afternoon,

V7R5 pretty up to date on PTFs.

In preparation for no longer using gmail for email relay we're working

with

a vendor to use a different relay. It so happens that the password is

69

characters long.

We have a couple Brother all-in-one devices that we (not often) email
documents to employees. They cannot handle passwords over 32

characters.

Also, our Tripplite UPS cannot handle passwords over 64 characters. No
problem, I thought. We'll just point them to the IBM i (in the cloud)

and

the IBM i can relay.

I found this article from some fly by night author (haha):

https://www.kisco.com/ibm-i-security-tips/ibm-i-smtp-relay-controls-2.html

I used ADDSMTPLE to add 3 *ACCEPT entries:

IP Address Subnet Mask
192.168.0.0 255.255.0.0
10.100.0.167 255.255.0.0
10.46.0.2 255.255.255.255

I point the Brother email settings to our IBM i internal IP address and

try

a test email.

Using port 25 gives this error at the Brother device

"Communication with the specified send e-mail server failed. It is

possible

that the network is busy or there is some problem. Please try again

later."

Using port 587 gives this error:

"The specified send e-mail server cannot be found. The Send E-mail

Server

doesn't exist or the specified host doesn't support the service. Check

the

Send E-mail Server name and port number."

Which leads me to believe that I am reaching the IBM i when using port

25

because the error is different.

I also tried it with the IBM i email relay to the not recommended
ALWRLY(*ALL) in case I fubared the ADDSMTPLE stuff. Same errors.

A support person had me install Putty and connect to the IBM i on port

25.

Got a blank screen with no welcome message. We did the same thing with

the

service we're going to be using and got a welcome screen that said the
service was ready. The support person felt that the IBM i was not
listening on port 25.

However, the Work with IPv4 Connection Status screen shows that it is.

Remote Remote Local
Opt Address Port Port Idle Time State
* * 21 020:47:45 Listen
* * 23 001:36:23 Listen
* * 25 000:04:35 Listen

I then tried with port 26 and got a "connection refused" message. So I
think I am connecting on port 25.

I'm guessing the issue is on our IBM i, but don't know what else to

look

at.

Suggestions?

Thanks.

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