CSSMTP was designed to mitigate several concerns with the SMTP client. As far as I can recall, there were some configuration options, that if not addressed, allowed the SMTP client to be a mail relay (among several others). CSSMTP was designed to eliminate those exposures.
I am not aware of any shops that use SMTP "to the mainframe". i.e. the mainframe is not usually the target for inbound communications. This would require a "email server" to be running on the mainframe (HRC anyone?) In most cases, and part of the logic related to the design of CSSMTP, is the "predicate" that the mainframe is only interested in outbound communications. Not sure if the above addresses your original issue, HTH, -----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Baxter, Bruce (ITS) Sent: Thursday, March 21, 2019 11:03 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: SMTP Mail from z/OS I'm going to cross post this to mvs-oe as well as here... The folks that support Comm Server in-house have approached me about replacing the SMTPD (which is apparently a USS / OE facility) with CSSMTP, and I've got some thoughts about the particulars of their implementation that don't sit well with me. I'm a relatively passionate and ardent z mainframe bigot - it's a great platform to work on. As mainframe folks tend to be, I'm a student of many platforms. I was shocked when I went back and looked that I wrote an SMTP client in Cobol a full 25 years ago that is deeply imbedded in all my shop's batch jobs sending reports and notifications. SMTP Port 25 sendmail / postfix is a staple and defacto standard worldwide as far as I can tell... When we had issues with our Lotus Notes MTA being reliably available and I couldn't prevail on the owners of that to make it enterprise bulletproof, we had our z/OS Comm Server folks fire up the local USS SMTPD sendmail daemon. It's been announced that function will be deprecated in the future and will be replaced by CSSMTP. After reading through the doc, I can't help but think that IBM z/OS CS support has lost their marbles. They're removing support for clients that want to send email via a local sendmail daemon listening on port 25 (or 587). That doesn't make sense... So my questions are: * Is anyone else using a local sendmail daemon on their system? From MVS? From USS? * Has anyone seen the process that is documented by the Sendmail / CSSMTP bridge used ANYWHERE but on z/OS? (I've never seen any script that used the sendmail command to send mail on any linux or aix system I've been on - they'd all use the mail command) * Is anyone using JES spool to send email off the platform? Bruce Baxter Assistant Director of IT | Revenue and Employment Portfolio | Architecture Office of Information Technology Services Building 8, W.A. 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