Unable to send a new email to certain domains.

[DColcl]

For some reason my SBS2k3 exchange server is unable to email to certain domains, Like Hotmail & AOL to name a few. I can email from those domains to my office, and I can reply to these emails and it will get to the hotmail & AOL accounts. But I'm unable to send a new email to these (and other) domains.

Here's what I'm getting on the Event log.

Application Log:

Source: MSExchangeTransport
EventID: 4007
Message delivery to the host “IP Address” failed while delivering to the remote domain ‘cs.com’ for the following reason: The connection was dropped due to an SMTP protocol event sink. The SMTP verb which caused the error is “quit”. The response from the remote server is “.

Source: MSExchangeTransport
EventID: 4006
Message delivery to the host <IP Address> failed while delivering to the remote domain “hotmail.com” for the following reason: An SMTP protocol error occurred.

Source: MSExchangeTransport
EventID: 4000
Message delivery to the remote domain “domain name” failed for the following reason: Unable to bind to the destination server in DNS.

Source: MSExchangeTransport
EventID: 3022
A non-delivery report with a status code of 5.5.0 was generated for recipient rfc822;johnnyt12@aol.com [Message-ID CD9F72628987684F8C3486D541359C0E47E643@mtcdc1.MTC.MTC-Title.com]
Cause: This message indicates a generic protocol error [SMTP error], For example, the remote SMTP responds to an issued EHLO with a 500 level error and the sending system will QUIT the connection and report this with NDR indicateing the remote SMTP server can’t handle the protocol.

I am unable to do the solution so I’m asking for your help when you can please.

 

[nsantin]

Do you have a Reverse DNS record for you mail server (on your ISPs DNS server)?

Did you search this forum before you asked this question?

 

[RichardHuang]

Anti-virus/Email scanning software on Exchange server could cause this problem.

 

[DColcl]

Yeah, it was some DNS setting on the ISP's server. Needed reverse PTR record.

Thank you both