receive connector on exchange 2013

how can I create several receive connectors on port:25 with different permission group and authentication, while there is default frontend receive connector on port 25?
in exchange 2013
tara behtoeeAsked:
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Ganesh Kumar ASr Infrastructure SpecialistCommented:
You can create several connector with port 25 but you need to do changes on the default connectors as well which is not recommended.

All mail flow should come into the Frontend Transport which then delivers it to the appropriate mailbox server where the mailboxes exist.  On a multi-role server, these two roles cannot utilize the same ports as they are two different services.  What this means is, when creating a relay connector, this connector must be created on the Client Access Server role that owns the Frontend Transport because this service is the service that owns port 25.  If you try to create a receive connector on the Mailbox Server role that owns the HubTransport service, mail flow may work temporarily, but it will eventually fail due to both the FrontendTransport and HubTransport services fighting each other for port 25.  Obviously if the Client Access Server and Mailbox Server roles are on different servers, it’s not an issue.

Try with your own risk  but you need to read this article to

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tara behtoeeAuthor Commented:
thanks for your reply,
I have multi-role server and I want create new receive connector that listen to port 25 (same as default frontend receive connector) with specific remote IP and specific permission group for relay SMTP request from application on my remote IP but I can do it.
I choose frontend transport role and custom type and all available IPV4 with port 25 with specific remote IP(same as article: )
but I cannot create it because it conflicts with default frontend receive connector
Should I change Default receive connector? and what change should I make?
Ganesh Kumar ASr Infrastructure SpecialistCommented:
What is the type of the connector you use? Frontend connector / Hub transport connector type
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tara behtoeeAuthor Commented:
frontend transport connector type
tara behtoeeAuthor Commented:
finally I found the problem,
I change remote network setting on default frontend connector, therefore I have conflict with specific IP address.
thanks for your help.
Ganesh Kumar ASr Infrastructure SpecialistCommented:
I am glad you solved the issue. Thanks for update.
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