Interfaces to the SMTP address space are:

• SMTP mail can be sent and received interactively over a TCP⁄IP network. Mail from TCP⁄IP network sites destined for local MVS™ users (or users on an NJE network attached to the local MVS system) arrives over this interface. All commands and data received and transmitted through this interface use ASCII characters.
• Interface from the Job Entry Subsystem (JES) spool, including any connected NJE nodes. SMTP commands can be written into a SYSOUT data set, with an external writer name of the SMTP address space. SMTP processes each of the commands in the data set in sequence, exactly as if it had been transmitted over a TCP⁄IP connection. This is how mail is sent from local MVS users to recipients on the TCP network. Batch SMTP data sets must contain commands and data in EBCDIC characters.

  For a description of batch SMTP in TSO utilities, see Using batch SMTP command in TSO utilities. For examples of batch SMTP, see Batch SMTP examples.

  Notes:

  1. This interface can be used to send mail only. Using the VERB command with this interface causes spool problems. For a description of the VERB command, see VERB command—Enable or disable verbose mode.
  2. With this interface, you might not be able to use certain SMTP options that require the NETDATA format. For details, see the z/OS Communications Server: IP Configuration Reference.

IBM z/OS® Communications Server TCP⁄IP provides an SMTP gateway function, which can be used to transfer electronic mail between an NJE network and a TCP/IP network, as shown in Figure 1.