Mail on z/OS

This topic describes how to configure the Simple Mail Transfer Protocol (SMTP) server, the Communications Server SMTP (CSSMTP) application, z/OS® UNIX sendmail, and popper. To determine the appropriate server or application to use, consider the following factors:

• Use CSSMTP if you want to forward mail from your NJE network or from local applications that write mail to a JES spool file, using the existing SMTP batch interface to forward the mail to other gateway servers.

  CSSMTP provides the easiest and simplest solution for this purpose, and if you currently use the SMTP server (SMTPD) for this purpose only, you should consider replacing SMTPD with CSSMTP.

  For more information about CSSMTP, see Configuring the CSSMTP application.

• Consider using both SMTPD and CSSMTP if you need to receive mail from the SMTP network into your NJE network or for local TSO users that use the TSO RECEIVE command interface to access their mail.

  You must continue to use SMTPD for receiving mail from the SMTP network. If you also need to send mail from those same users, you can use CSSMTP to send that mail from JES. CSSMTP can run concurrently with SMTPD.

  For more information about SMTPD, see Configuring the SMTP server (SMTPD).

• Use z/OS UNIX sendmail if you need to receive or send mail from local z/OS UNIX shell users, or from remote POP/SMTP clients that use your z/OS system as a mail server.

  Sendmail can run concurrently with CSSMTP, SMTPD, or both.

  For more information about sendmail, see Configuring z/OS UNIX sendmail and popper.