SMTP PARAMETERS
The SMTPD module incorporates SMTP to handle connection requests and receive messages from peers on the Internet. This screen allows you to configure the different SMTP parameters used by SMTP. To configure, do the following:

  1. Enter the SMTP Ports:
  2. Tick the check boxes of the ESMTP support features you wish to activate:
  3. Configure the Delayed mail Notification parameters:
  4. Specify the SMTP Timeout Tunings

  5. Indicate the Data Buffer size, which refers to the size (in bytes) of the data buffer used by the SMTP programs to read data from the Internet. If the machine uses disk caching, set this option to the size of the read ahead buffer. The default value is 4096 (4K); the maximum buffer size is 32768 (32K).
  6. Tick the check box of the Set 554 SMTP error temporary option. RFC821 on SMTP is not clear as to whether error 554 transaction failed during the DATA phase should be regarded as a permanent error. Usually 5xx errors are permanent, but some SMTP servers return 554 errors as temporary errors. IEMS takes the conservative approach and re-tries such message later. If this option is set to NO, then such messages will be bounced instead or re-sent to their intended recipients. The default is YES.
  7. Click the Submit button to implement the settings.