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My research indicates that same - it's their problem. &nbsp;However, they companies (about five of them) say they are not the issue. &nbsp;We have no multiple recipients etc. &nbsp; I can send to their companies from my yahoo and aol accounts, but NOT from our office. &nbsp; No one in my office can send to these accounts using the office email. 
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My research indicates that same - it's their problem.  However, they companies (about five of them) say they are not the issue.  We have no multiple recipients etc.   I can send to their companies from my yahoo and aol accounts, but NOT from our office.   No one in my office can send to these accounts using the office email.

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I found your resolve for the 4.4.7, but all it said was find out what the MTA says. &nbsp;My MTA is not active, which your database says is normal. &nbsp; Most of our emails go out fine, but with a few companies &nbsp;I keep getting the 4.4.7 error. &nbsp;I have sbs 2003. &nbsp;
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I found your resolve for the 4.4.7, but all it said was find out what the MTA says.  My MTA is not active, which your database says is normal.   Most of our emails go out fine, but with a few companies  I keep getting the 4.4.7 error.  I have sbs 2003.  

Undeliverable message 4.4.7 and MTA not active

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).

Software is any set of instructions that directs a computer to perform specific tasks or operations. Computer software consists of programs, libraries and related non-executable data (such as documentation). Computer software is non-tangible, contrasted with computer hardware, which is the physical component of computers. Software written in a machine language is known as "machine code". However, in practice, software is usually written in high-level programming languages than machine language. High-level languages are translated into machine language using a compiler or interpreter or a combination of the two.