550 5.7.1 Unable to relay for gmail , hotmail..... : microsoft, exchange, 2003, 550 5.7.1 Unable to relay for gmail , hotmail.....

May 17, 2008 08:53am pdt

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01.18.2008 at 11:41PM PST, ID: 23095348

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5.4

550 5.7.1 Unable to relay for gmail , hotmail.....

Zones: Simple Mail Transfer Protocol (SMTP), Exchange Email Server

Tags: microsoft, exchange, 2003, 550 5.7.1 Unable to relay for gmail , hotmail.....

I have an exchange server in my domain. Inside my domain, I can send email to gmail, hotmail with no problem. Also I can send email back and forth to pop3 client when they are not in domain.

The problem is when pop3 client try to send email to gmail or hotmail, they always get this message "550 5.7.1 Unable to relay for XXX@gmail.com" . If this is sending to my domain, the mail can be relayed.

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Question Stats

Zone: Networking

Question Asked By: wuitsung

Solution Provided By: wuitsung

Participating Experts: 4

Solution Grade: B

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01.19.2008 at 12:10AM PST, ID: 20696570

top_rung:

On the pop3 client, which is set as the default account - the exchange account of the POP3?

01.19.2008 at 12:18AM PST, ID: 20696577

wuitsung:

sorry, I don't really understand what you mean...

The user is using using outlook at home and configured as pop3 client to retrive email from exchange server. let's say my domain is abc.com. If he send email to anyone@abc.com it will work, Also people send email from gmail account to his email account it's also working. The problem is only when he send to gmail, hotmail he will get this message.

01.19.2008 at 12:23AM PST, ID: 20696585

Rank: Sage

ikm7176:

make sure that "computers which successfully authenticate to relay" is checked. For details follow the link belo
http://www.howtonetworking.com/others/ndr571d.htm

Hope this helps you!!

01.19.2008 at 12:30AM PST, ID: 20696590

wuitsung:

that was checked.... still has the same problem

01.19.2008 at 12:39AM PST, ID: 20696603

top_rung:

are they set to use Secure Password Authentication?

01.19.2008 at 12:41AM PST, ID: 20696606

Rank: Sage

ikm7176:

Is it for a single user or all users?
Is the problem with pop3 clients only? what about MAPI (Microsoft Outlook) Clients?

01.19.2008 at 12:54AM PST, ID: 20696633

wuitsung:

Sorry, I think I didn't describe my situation clearly. Because I thought it was also not working like this senario.

Actually, I have an exchange server and for the SMTP virtual server, everything is set by default, except I fill out smart host IP there [10.0.1.2]

I also setup a SMTP relay server (10.0.1.2).

On Exchange:
- Allow incoming mail to be delayed to this domain is checked.
-Forward all mail to smart host [10.0.1.1]
Relay: only the list below
Allow all computers which successfully authenticate to relay
Everthing else is default setting.

On SMTP relay server
Default SMTP virtual server property:
Ip address:10.0.1.2
Relay: only the list below:10.0.1.1
Allow all computers which successfully authenticate to relay
Everthing else is default setting.

If I disabled the SMTP relay server, pop3 email client send to gmail is wroking.

01.19.2008 at 12:56AM PST, ID: 20696637

wuitsung:

Sorry, the first one should be SMTP relay server, and the second one is Exchange

01.19.2008 at 01:04AM PST, ID: 20696654

Rank: Sage

ikm7176:

So the NDR generated by server 10.0.1.2. Wonder why are you using SMTP relay server for.
For a test, can you change your POP3 clients settings to use your SMTP relay server to send emails?

01.19.2008 at 01:06AM PST, ID: 20696658

wuitsung:

Let me rewrite this...
exchange ip: 10.0.1.1
SMTP relay server ip:10.0.1.2

On Exchange:
smart host:[10.0.1.2]
Everthing else is default setting

On SMTP relay server:
- Allow incoming mail to be delayed to this domain is checked.
-Forward all mail to smart host [10.0.1.1]
Default SMTP virtual server property:
Ip address:10.0.1.2
Relay: only the list below:10.0.1.1
Allow all computers which successfully authenticate to relay
Everthing else is default setting.

01.19.2008 at 01:11AM PST, ID: 20696665

top_rung:

Does the ISP have the proper reverse DNS entries?

01.19.2008 at 01:12AM PST, ID: 20696666

wuitsung:

how can I check this?

01.19.2008 at 02:52AM PST, ID: 20696804

wuitsung:

I just fixed the problem.

The problem is in the outlook client. I need go to outgoing server -> check My outgoing server (smtp) requires authentication. And below, select log on using: type in username/password.

Also, check the log on using secure password authentication(SPA)

Accepted Solution

01.19.2008 at 03:45AM PST, ID: 20696903

Rank: Sage

ikm7176:

Glad that you fixed the problem. cheers!

01.19.2008 at 05:46AM PST, ID: 20697207

Vee_Mod:

A request has been made in Community Support to close this question:
http://www.experts-exchange.com/Q_23095445.html

If there are no objections, a moderator will finalize this question in approximately 4 days as follows:
PAQ with refund using {http:#a20696804}

Please only post in this question again if you have an objection.

Vee_Mod
Community Support Moderator

Vee_Mod

01.23.2008 at 09:03AM PST, ID: 20725107

Closed, 250 points refunded.
Vee_Mod
Community Support Moderator

mysaleem

03.09.2008 at 07:23AM PDT, ID: 21081317

I am having the same problem now. I tried all options listed but no resolution. I am running exch2007 (mailbox on cluster, cas & ht on one server, et on one server in dmz), the ht server hosts pop3. i can connect to my mail using pop3, i receive mails also but cannot sent out to even gmail. error is unable to relay. anyone has solution.

Vee_Mod

03.09.2008 at 11:22AM PDT, ID: 21082147

mysaleem -
Please open your own question with a full description of your symptoms.

The Experts only reward for assisting is the points you assign (and award) when they give you a solution.

Vee_Mod

mysaleem

03.09.2008 at 12:18PM PDT, ID: 21082324

Thanks for opening the case. Like i explained earlier, I have mailbox server in 2-node cluster(active-passive).
The third server is CAS as well HT server with POP3 & IMAP. Since most of our users use POP3 and also use mobiles to download emails. From outlook i can connect to our excvhange using POP3, I can receive emails also.
Earlier all was working fine, but now i started to get the error 550 5.7.1 Unable to relay.....
The fourth server is the ET which is placed in DMZ as smtp server.
authentication is plaintextlogon.
pls. let me know if more info is required.
thanks in adv.

Vee_Mod

03.09.2008 at 12:40PM PDT, ID: 21082407

You misunderstood me.
You need to open a new question of your own and work with the Experts who respond.

Please go to the following link and read about how to open your own question.

http://www.experts-exchange.com/help.jsp#hs7

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