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Ibrahim Bazarwala
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Exchange mail server 2003

Dear Experts,
I have an Exchange server 2003. I am hosting our company's website on one server hosted by Hetzner. This server is a web server. Plesk panel made default mail server as Postfix. The main.cf file contain relay server as our company's email server which is exchange 2003 server. In the main.cf file I put my exchange server as a relay host
relayhost = mail2.hassanabul.com\par
I send mail through psp command but when I send mail to other than my own domain, it fails and our barracuda device shows
Invalid Recipient (cuda_nsu 5.7.1 Unable to relay for hac@plesk.hassanabul.com )
Any help will be appreciated.
ExchangeEmail ServersEmail Clients

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Last Comment
Ibrahim Bazarwala

8/22/2022 - Mon
Justin Yeung

it sounds like your spam filter disallow your exchange server to do the relay.

you might have to add the IP of the exchange server to the allow list.
Ibrahim Bazarwala

Thanks for the comment.
I am using barracuda spam filter device. I have to add the IP address of the webserver or the exchange server?
Justin Yeung

your exchange server.
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Ibrahim Bazarwala

My exchange server is already up and running and sending and receiving mail.
Justin Yeung

all good?
Md. Mojahid

Your Exchange mail server is not properly configured to relay messages.

Open the Exchange System Manager
Go in Administrative Groups -> Administrative group name -> Server -> Server name -> Protocols -> SMTP
Right click on Default SMTP Virtual Server -> properties
Access tab -> Relay button
Select "only the list bellow" and add your domain and\or IPs you do want to allow the relay.
Check the "Allow all computers which successfully authenticate to relay, regardless of the list above" checkbox.
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Ibrahim Bazarwala

I did the above steps except Allow all computers which successfully authenticate to relay regardless of the list above checkbox. I am receiving the error in Barracuda as the attached file. From that webserver if I put ibrahimbzr@gmail.com it converts that address to root@plesk.hassanabul.com. Please suggest.
Ibrahim Bazarwala

Hello Md. Mojahid,
I did your previous steps as well but with no luck.
Ibrahim Bazarwala

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Ibrahim Bazarwala

I found solution myself.
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