XFOR: Some Connection Parameters Not Configurable Per Domain

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The ability to set these four values on a per e-mail domain basis is very important to some people who want interoperability with single-threaded SMTP gateways like the Microsoft Mail 3.x SMTP gateway.

However, the only current solution, to send SMTP mail directly to a Mail 3.x gateway, would hinder overall performance. This gateway runs on MS-DOS and can only support one connection at a time. This will cause a problem when an outside host tries to make multiple connections to the MS-DOS computer because it could result in:

• Many retries initiated as the IMC tries to open multiple threads to a single-threaded SMTP gateway.
  
  
• Lock-ups of single-threaded SMTP gateways.
  
  
• Loss of overall IMC performance because the "maximum number of connections to a single host" must be set to 1.