Exchange CAS-Servers Hostname Send Connector

Hello,

currently we have the following problem.
We have two Backendservers and two cas-servers working as "Proxy through client access server".

Now we have one FQDN configured on Send Connector "smtp.domain.de"
"smtp.domain.de" has an A Record to IP-Address 222.222.222.2

But CAS-Servers have IP-Addresses 222.222.222.3 and 222.222.222.4

Now if an email is send it is shown in email header like this

"Received from smtp.domain.de with IP-address 222.222.222.3"
or
"Received from smtp.domain.de with IP-address 222.222.222.4"

But spamfilters maybe filter this as spam, because smtp.domain.de points to ip-address 222.222.222.2

How to resolve this?
I can not configure any ip-addresses on send connector.
uhscaleAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
This does not matter. As long as you you sending from the same external public IP address an internal IP does not matter. The minimum requirement to send email on the internet without being flagged as spam follows...

- A record for domain.com
- MX record for mail.domain.com
- Reverse record (PTR) IP > mail.domain.com (you need to contact your ISP to get them to create the reverse record for you)

As long as you have the above you will not be flagged as a spammer.

Another addtional step you can do is create an SPF record. This is another level of authenticity. With an SPF record you have more flexibility in that you can add multiple external IP addresses as Sending Servers on the internet.

So that being said spam filters do not care about the internal IP address of where the email came from as it could have come from several different internal Exchange servers. The External IP address is what is important here.

Will.
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uhscaleAuthor Commented:
Hello,

no both cas servers have an external ip-address and are connected directly to the internet. And that's the problem.

So cas server 1 is sending with ip-address 222.222.222.3 and hostname "smtp.domain.de"
Second cas server is sending with ip-address 222.222.222.4 and hostname "smtp.domain.de"

I found no way to configure one ip-address to both cas servers. Or configured individuell fqdn for every cas server.

In Exchange 2010 this was working without any problems.
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Will SzymkowskiSenior Solution ArchitectCommented:
Ok no problem. As i stated already all you need to be able to do is create a SPF record and add both IP's to this record. This will allow you to send from these different IP for the same smtp.domain.de.

Thats all that is required.

Will.
0

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uhscaleAuthor Commented:
Hello,

ok thanks
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