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421 Terminating connection as maximum allowed messages have been received

Created: 19 Mar 2008 • Updated: 02 Mar 2009

I have a recurring, long-term problem with messages being bounced back to their sender, detailed below.  I'm running SMS for SMTP v. 4.1.12.43 on a Windows 2000 server.

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Mar 18, 2008 6:27:21 PM  Action: Message Delivery Attempt Failed  Client: [sender ip address]  From: [sender email address]  
To: [recipient email address]  Subject: Successful Credit Card Settlement Report.  SMTP ID: M2008031819272028517  
Connection ID: 42791  Last Command: RSET  Last Response: 421 Terminating connection as maximum allowed messages have been received.  

Mar 18, 2008 6:27:21 PM  Action: Disconnected  Server: [SMS ip address]:25  Connection ID: 42791  
Info: Actual  

Mar 18, 2008 6:27:21 PM  Action: Connection Closed  Server: [SMS ip address]:25  Connection ID: 42791  
Last Command: QUIT  

Mar 18, 2008 6:27:21 PM  Action: Message Generated  From: [sms alert notification email address]  To: [sender email address]  
Size: 4518  SMTP ID: M2008031819272128518  Reference SMTP ID: M2008031819272028517  
Info: Automatically generated bounce message.  

Mar 18, 2008 6:27:21 PM  Action: Message Bounced  Client: [sender ip address]  From: [sender email address]  
To: [recipient email address]  Subject: Successful Credit Card Settlement Report.  SMTP ID: M2008031819272028517  
Info: Permanent error involving remote host.  Info2: 421 Terminating connection as maximum allowed messages have been received.   

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