Comments on: How to Configure a Relay Connector in Exchange Server 2013

By: fuad

fuad — Wed, 15 Dec 2021 08:53:49 +0000

Dear Paul,
I’m an exchange server, 2016 admin, configure SMTP relay and working fine with sending mail to internal but when the SMTP server tries to external mail its not send or send it in the next day

DEBUG SMTP: use8bit false
MAIL FROM:NoReplyTo@^M
250 2.1.0 Sender OK^M
RCPT TO:fissehawelu2@gmail.com^M
550 5.7.54 SMTP; Unable to relay recipient in non-accepted domain^M
DEBUG SMTP: Invalid Addresses
DEBUG SMTP: fisseha w fissehawelu2@gmail.com
DEBUG SMTP: Sending failed because of invalid destination addresses
RSET^M

but the destination mail address is valid i checkd it by mail

By: Carlos Cruz

Carlos Cruz — Fri, 30 Jul 2021 19:01:22 +0000

Good morning Paul, I am new to the Exchange administration, I find the following problem, in my organization there is a team that sends notifications via SMTP, but they do not reach the recipients, check the SMTP LOGS of the server and this appears:

2021-07-29T23: 56: 54.678Z, XXXXX \ Default Frontend XXXXX, 08D9014954C35895,18,127.0.0.1: 25,127.0.0.1: 17531, <, MAIL FROM: inboundproxy@contoso.com,
2021-07-29T23: 56: 54.678Z, XXXXX \ Default Frontend XXXXX, 08D9014954C35895,19,127.0.0.1: 25,127.0.0.1: 17531, *, SMTPSubmit SMTPAcceptAnySender SMTPAcceptAuthoritativeDomainSender AcceptRoutingHeaders, set session permissions
08D9014954C35895,22,127.0.0.1: 25,127.0.0.1: 17531, , 250 2.1.5 Recipient OK,
2021-07-29T23: 56: 54.678Z, XXXXX \ Default Frontend XXXXX, 08D9014954C35895,24,127.0.0.1: 25,127.0.0.1: 17531, <, DATA,

But if I try the notifications from another computer if they arrive in advance, thank you very much for the help.

By: Bladimir Trujillo

Bladimir Trujillo — Thu, 03 Sep 2020 18:06:03 +0000

Good morning Paul, it’s the first time i contact you, your articles are very nice, is it possible if you could help with some article to configure a connector with the port 587, we need to implement a relay connector with authentication, we have two servers exch 2013 dag, ths. for your comments
Quito-Ecuador,
Bladimir Trujillo Vinueza

By: Swetha

Swetha — Tue, 25 Aug 2020 07:07:19 +0000

Thank you so much Paul

By: Rogelio

Rogelio — Mon, 20 Jul 2020 21:36:53 +0000

Muchas gracias por el aporte, pude solucionar el problema de mi conector relay para enviar a correos externos.

By: Manfred

Manfred — Thu, 25 Jun 2020 06:29:46 +0000

Nice article, but what to do if there are nmessed up connectors?

I am trying to get a list of all IPs that are sending mails trough an “open relay” connector to secure it.

because I am not very firm in Powershell I’ve tried the simple way:

Get-MessageTrackingLog -Start “03/01/2020 00:00:01” -ResultSize unlimited -EventID Receive |where {$_.ConnectorId -like “SERVERNAME\CONNECTOR”} |Select-Object Timestamp,ServerIp,ClientIP,ConnectorID,Sender,@{l=”Recipients”;e={$_.Recipients -join ” “}}, EventID | Export-Csv -Path C:\_Scripts\Results\RECEIVE_by_IP.txt

But there are more than 850000 entries.
How can I add a filter so that I’ll give me IPs only once?

By: Nazir Shah

Nazir Shah — Thu, 28 Mar 2019 05:59:35 +0000

I followed this article step by step and it worked for internal emails. but when i use the external user, it give the error:

rcpt to: testsmpt@gmail.com550 5.7.1 Unable to relay

please help.

By: Chai

Chai — Thu, 21 Mar 2019 09:18:57 +0000

Hi Paul,

Thanks for the guide. Works perfectly 🙂

Cheers

By: Mark Rogerson

Mark Rogerson — Thu, 14 Mar 2019 16:13:02 +0000

I have been an admin for Exchange since the early 2003 days; Paul, this article was absolutely wonderful. This was exactly what I was looking for and it worked first time using two CAS servers, two mailbox servers, and a DNS DAG needing the frontend SMTP relay. You took something that so many people make confusing and did two key things:
1.) Simple to follow and accurate
2.) Explained the why without all of the stupid babble that others try to confuse folks with

I am going to follow this site and read more of your articles specifically because of how good this was. From one engineer to another, thank you.

By: thomas

thomas — Fri, 08 Mar 2019 22:07:42 +0000

I have created a relay connector that mail sql server uses to send mails to external recipients. Some of those mail are rejected because for spf. In the NDR I can see that it is because the .local names and local IP addresses are showen and not the public name like .dk.