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too much outbound traffic to hotmail

By bam86_be ·
I reported too much traffic coming from my exchange server outgoing to hotmail servers.
There are no message in the smtp virtual server.
Ip adresses are changing from time to time and tcp ports are changing too (of course always to or from my smptport). Ip addresses are always hotmail servers.
Packets are not filled with text.
Our antivirus soft is up to date, a firewall is present. The server is configured to not be used as relay.
The traffic is very important using almost all of the outgoing bandwith
As somebody an idea ? Spam ? another way for relaying ? Virus ?
How to identify what and how to correct it ?

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too much outbound traffic to hotmail

by curlergirl In reply to too much outbound traffic ...

Is it possible that you have users that are using MSN Messenger and are connected all the time? Since hotmail users can use their hotmail account to log on to MSN Messenger, this might be the source of this traffic, as Messenger will be checking constantly for any messages on the MSN server(s). Hope this helps!

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too much outbound traffic to hotmail

by bam86_be In reply to too much outbound traffic ...

All the traffic comes from the mail server and no one else is granted in the firewall to go outside with smtp protocol. I don't know about MSN but does it use SMTP ?

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by bam86_be In reply to too much outbound traffic ...

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