Binding specific user account in bulk mail SMTP server recive connector

Question

Binding specific user account in bulk mail SMTP server recive connector

Md. Mahfuzur Rahman 346

is there any option for adding permission into the SMTP server receive connector for a specific user account?

Only specific users can send by SMTP server which we allowed.

LilyLi2-MSFT 1,981 Reputation points

2022-12-05T09:41:05.097+00:00

Hi,
Did Andy's suggestions help you?
If the following suggestion helps, please click “Accept as answer” to mark helpful reply. Your action would be helpful to other users who encounter the same issue and read this thread.
Thanks.
Md. Mahfuzur Rahman 346 Reputation points

2022-12-06T09:27:08.907+00:00

No,

Is there any option application can not send any mail by SMTP server without authentication?
LilyLi2-MSFT 1,981 Reputation points

2022-12-12T10:06:28.18+00:00
Hi,

Sorry for the late reply.

From my research, this doesn't seem to have any permissions to restrict receive connectors.

It is recommended that you review this similar thread:1985776-application-not-able-to-send-email-via-exchange-server

Log into the ECP > Mail Flow > Receive Connectors. Click the + sign to add a new receive connector. Give it a descriptive name, and choose the Frontend Transport role. Choose the type Custom and click Next. Select the port you wish to listen on - which is usually fine at 25 from all available IPv4. Click Next. Edit the remote IP Addresses listing that is there by default, and add only the IPs or IP range that you wish to use this Receive Connector for. Click on OK, and then Finish.

Go to the Security section, and make sure that the only boxes checked off are:

Transport Layer Security (TLS)

Externally secured (for example, with IPsec)

Exchange servers

Thanks for your understanding and support.
LilyLi2-MSFT 1,981 Reputation points

2022-12-20T06:18:53.997+00:00

Hi,
It has been a few days and I am checking in to see how things are going on with this issue. Do you perhaps have any further concerns or questions?

2 answers

Your answer

LilyLi2-MSFT 1,981 Reputation points

2022-12-05T09:41:05.097+00:00

Hi,
Did Andy's suggestions help you?
If the following suggestion helps, please click “Accept as answer” to mark helpful reply. Your action would be helpful to other users who encounter the same issue and read this thread.
Thanks.
Md. Mahfuzur Rahman 346 Reputation points

2022-12-06T09:27:08.907+00:00

No,

Is there any option application can not send any mail by SMTP server without authentication?
LilyLi2-MSFT 1,981 Reputation points

2022-12-12T10:06:28.18+00:00

Hi,

Sorry for the late reply.

From my research, this doesn't seem to have any permissions to restrict receive connectors.

It is recommended that you review this similar thread:1985776-application-not-able-to-send-email-via-exchange-server

Log into the ECP > Mail Flow > Receive Connectors. Click the + sign to add a new receive connector. Give it a descriptive name, and choose the Frontend Transport role. Choose the type Custom and click Next. Select the port you wish to listen on - which is usually fine at 25 from all available IPv4. Click Next. Edit the remote IP Addresses listing that is there by default, and add only the IPs or IP range that you wish to use this Receive Connector for. Click on OK, and then Finish.

Go to the Security section, and make sure that the only boxes checked off are:

Transport Layer Security (TLS)

Externally secured (for example, with IPsec)

Exchange servers

Thanks for your understanding and support.
LilyLi2-MSFT 1,981 Reputation points

2022-12-20T06:18:53.997+00:00

Hi,
It has been a few days and I am checking in to see how things are going on with this issue. Do you perhaps have any further concerns or questions?

Answer 1

Andy David - MVP 157.8K MVP Volunteer Moderator

There is no option to prevent on--prem users from using SMTP authentication for on-prem servers - nor can you scope a receive connector to only certain accounts.

You can, however, scope a receive connector to specific IPs

https://learn.microsoft.com/en-us/exchange/mail-flow/connectors/custom-receive-connectors?view=exchserver-2019#use-the-eac-to-create-a-receive-connector-that-only-accepts-messages-from-a-specific-service-or-device-on-mailbox-servers

Answer 2

Md. Mahfuzur Rahman 346

Actually, my requirement Application can not send any mail using the Exchange SMTP server without authentication.

How can I enable this, what would be the received connector setting for the SMTP server?
Need help or suggestions

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Binding specific user account in bulk mail SMTP server recive connector

2 answers

Your answer