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Please check if the IP address you're connecting from has a correct reverse dns record. Some mail servers reject machines without rev-dns without saying a word.
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Please check if the IP address you're connecting from has a correct reverse dns record. Some mail servers reject machines without rev-dns without saying a word.

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Please check if they have put your Domain/IP into their AntiSpam as a black list. You might not be on Public RBL but could be on theirs.<br />
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Please check if they have put your Domain/IP into their AntiSpam as a black list. You might not be on Public RBL but could be on theirs.



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My team Received always NDR message (ESMTP #554 Transaction Failed Spam Message not queued. ##) when they send for some domain and i tried to telnet the domain but i received the error : 421 4.3.2 Service not available, closing transmission channel<br />
i have exchange 2007 sp3 <br />
please any solution for this problem
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My team Received always NDR message (ESMTP #554 Transaction Failed Spam Message not queued. ##) when they send for some domain and i tried to telnet the domain but i received the error : 421 4.3.2 Service not available, closing transmission channel
i have exchange 2007 sp3 
please any solution for this problem

ESMTP #554 Transaction Failed Spam Message not queued. ##

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.