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digital randy

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Hello,

Kind of a strange one here, hopefully someone has tackled this problem earlier. Here is goes...

When using the T-Mobile HotSpot wireless access available in Starbuck, etc., I can't send mail through KMS with SMTP authentication enabled on my Mac (both Mail and Entourage). If I turn off SMTP auth within my mail client I am able to send messages despite the setting requiring authentication on the KMS server.

As far as T-Mobile and I can figure it has something to do with the fact that they use relaying to send email from all the different locations, mailrelay.t-mobile.com, actually is the server name. Unfortunately, there are no DNS entries for that server name so I can't create a SMTP rule to allow messages to be sent without auth.

Any ideas?? Sorry if I have been unclear in any part of my explanation.

Thanks,

Randy
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cying

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Is it possible that somehow Authentication is not working but your
setting to allow POP before SMTP worked so your email is allowed to
be sent via Kerio? Just a guess. I have only used Webmail from
Starbucks with my laptops and they work fine (MacOSX and WinXP).

Charles



At 9:36 AM -0600 6/15/04, digital randy wrote:
>Hello,
>
>Kind of a strange one here, hopefully someone has tackled this
>problem earlier. Here is goes...
>
>When using the T-Mobile HotSpot wireless access available in
>Starbuck, etc., I can't send mail through KMS with SMTP
>authentication enabled on my Mac (both Mail and Entourage). If I
>turn off SMTP auth within my mail client I am able to send messages
>despite the setting requiring authentication on the KMS server.
>
>As far as T-Mobile and I can figure it has something to do with the
>fact that they use relaying to send email from all the different
>locations, mailrelay.t-mobile.com, actually is the server name.
>Unfortunately, there are no DNS entries for that server name so I
>can't create a SMTP rule to allow messages to be sent without auth.
>
>Any ideas?? Sorry if I have been unclear in any part of my explanation.
>
>Thanks,
>
>Randy



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sidbarker

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A possible answer is that some ISPs intercept traffic to SMTP servers and route it through their own servers - i.e. you cannot connecto to a specific SMTP server, you have to use the ISPs.
So the reason authentication doesn't work is that you are trying to authenticate against the ISPs server, not your own.

Whilst at Stabucks, from DOS try to TELNET to your SMTP server port 25, and see if the response message is yours or another one.

We had this problem a few years ago with an ISP, where an automated system would send data via SMTP (was easiest option at the time) directly to our servers. The changes the ISP made meant all emails came via them and then via our ISP. As we were sending hundreds per hour, our ISP got very upset!

Solved the problem by using a different port on our firewall and redirecting that to the SMTP Server.
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sirjosi

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ah. I know this problem all too well.

You guys have mentioned the right problem. tmobile uses its own smtp then throws it to your kerio mailservers smtp. Well guess what? We dont trust tmobile smtp server! not until you add it to your relay list anyway.

Get the list of tmobile's smtp server IPs and add it to your allow relay list. It sucks, but it should work. You will probably have to add an entire subnet as there are a lot of tmobile smtp servers out there.

Obviously, this info should come from tmobile bec if I give it to you, it may be im giving you false info and opening your server up.

Id like to know if this worked or not for you.

Hope this helps.
sirjosi

pay it forward
-sirjosi
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digital randy

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Sirjosi,

Thanks for the confirmation of the problem, glad to know I'm not alone.

I tried to find a corresponding IP address for the smtp server listed by the bounce back message, but there was no DNS record. Any ideas how to find the IP addresses of the servers, I doubt that Starbucks will just hand out that info?

Thanks again,

Randy
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sirjosi

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Here's some ips ive used. I urge you to call tmobile and confirm these ips.
208.54.120.1 - 208.54.260.1 (sample range)
208.54.142.1
208.54.143.1

Heres some that Ive seen.

some stuff I did to gather his smtp ips (altho I also talked to tmobile support)

1) asked my user to forward me the bounced email. I opened this email in notepad and got starbucks smtp ip.

2) I also had my user go to http://www.whatismyip.com/ when he was at starbucks. I then checked this ip with kerio security logs to find why it is being blocked.

3) I went to starbucks myself and used my users account with his permissions and poked around what ip I got, etc etc

If your user is always in the same starbucks, it might be easier for you. For me, my user goes through the entire state so it's not a closed case yet. I'm still gathering tmobile ips.

another thing you can do is have him use tmobiles smtp server instead of yours. I havent tried this route yet tho. But I had to resort to this for some users who use cox internet and aol.

third is advocate webmail :)

thanks
sirjosi

[Updated on: Tue, 22 June 2004 08:05]


pay it forward
-sirjosi
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