The 20 Minute E-Mail Solution!
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Setting a Delay Between Recipients

You can set a delay between recipients within a message for relayed external mail. This prevents spammers from taking all your CPU time; however, it also makes your server a little slower.

Note: Some servers send all RCPT lines at once without waiting for a return. In such cases, this setting can cause problems.

  1. Locate the following key 
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SMTPD32\Parameters
  2. Under this key, locate the registry string variable named DelayBetweenRCPT; if none exists, create one.
  3. Set the DWORD value to the number of milliseconds to sleep between successive RCPTs. (Note that 0 means no wait.)
  4. Stop and restart the SMTP server.

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