ArmstrongInt
asked on
Exchange 2007 HELO configuration
Hi there
My mail server has just been blacklisted on CBL and I was needing some help with HELO configs.
Basically when using there test email helocheck@cbl.abuseat.org I am told my HELO is incorrectly configured.
This is because I am using our ISP's SMTP server to relay so the helo string is
550 HELO for IP 212.74.**.66 was "mc26.lon.server.colt.net"
However when I use DNS to route its fine.
550 HELO for IP 80.169.***.15* was "sc-ex1.mydomain.local">
I would prefer to use their SMTP server as sometimes DNS mail is delayed to certain domains like yahoo.com and aol.com.
I am wondiering if there is away of telling the HELO packet to keep its original form, not take on the ISP's SMTP server, I maye need to contaxct the ISP I know but figured I'd bounce this off some experts.
Cheers
Arm
My mail server has just been blacklisted on CBL and I was needing some help with HELO configs.
Basically when using there test email helocheck@cbl.abuseat.org I am told my HELO is incorrectly configured.
This is because I am using our ISP's SMTP server to relay so the helo string is
550 HELO for IP 212.74.**.66 was "mc26.lon.server.colt.net"
However when I use DNS to route its fine.
550 HELO for IP 80.169.***.15* was "sc-ex1.mydomain.local">
I would prefer to use their SMTP server as sometimes DNS mail is delayed to certain domains like yahoo.com and aol.com.
I am wondiering if there is away of telling the HELO packet to keep its original form, not take on the ISP's SMTP server, I maye need to contaxct the ISP I know but figured I'd bounce this off some experts.
Cheers
Arm
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ASKER
ok great, so have one connector set to * and the other one for aol & yahoo.com ?
thanks
thanks
Yes. Make sure that both the connector has a cost of 1. Otherwise, it will always use the * connector.
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You need to be aware that some of the testing sites give inaccurate results for an Exchange 2007 server.
Exchange 2007 gives different helo/ehlo/banner for inbound and outbound traffic. For inbound traffic it will always announce itself as the internal server name - that is the only option available. Consequently the tests for email flow will say that is a failure because they just connect to port 25 and see what it says.
However for outbound email, the FQDN set on the Send Connector is used, which can be different.
Simon.
Exchange 2007 gives different helo/ehlo/banner for inbound and outbound traffic. For inbound traffic it will always announce itself as the internal server name - that is the only option available. Consequently the tests for email flow will say that is a failure because they just connect to port 25 and see what it says.
However for outbound email, the FQDN set on the Send Connector is used, which can be different.
Simon.
Its always best to put a public address (your owa url) rather than your internal domain details. In EMC -> Org Hub Transport -> Send connectors -> Properties -> Change it to mail.yourdomain.com