In our shop we have a started task called SMTP which is associated to a 
JES output class. That started task's cataloged procedure calls 
PGM=MVPMAIN with a CONFIG DD reading a certain statement for NJEDOMAIN. I 
think this is the SMTP setup "not CSSMTP". You might check this in your 
environment. I am pretty sure, your NJEDOMAIN reads ZOS. The interesting 
point is *not* to set up an NJE node or even network (I think you can do 
but that's another story). Here, the NJE domain name is used in the 
default set of rewrite rules for the RFC822 header fields. For us this is 
a good (or "correct") setup when for example we IEBGENER our memos to the 
JES output class associated with SMTP. We just write "HELO ZOS" and our 
SMTP started task will forward the correct way to our Lotus Domino service 
including query of MX records and all that stuff.

Cheers
Michael






Von:    Frank Swarbrick <0000002782105f5c-dmarc-requ...@listserv.ua.edu>
An:     IBM-MAIN@LISTSERV.UA.EDU
Datum:  2014-09-02 20:56
Betreff:        z/OS SMTP server
Gesendet von:   IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU>



I am writing a simple CICS application to use the EXEC CICS SPOOLxxxx 
commands to write data to JES to be used by z/OS SMTP (not CSSMTP which we 
do not have running).  My question is simple, but perhaps the answer is 
not.  The question is, what is the best way to get the correct "domain 
name" to be used in the SMTP HELO command?

We have quite a few batch processes that use the z/OS SMTP server to send 
email.  All of them appear to just have coded "HELO ZOS".  While this 
works, it also is not technically "correct" because "ZOS" is not in fact 
the "domain name".  Rather, in our DEV LPAR it should be "zosd.fb" and in 
production "prd1.fb".  So we have a lot of the following the the SMTP 
LOGFILE DD:
EZA5460I 09/02/14 09:01:24 BSMTP Helo Domain: ZOS I've never heard of you!
rather than the more desirable:
EZA5460I 09/02/14 12:23:11 BSMTP Helo Domain: zosd.fb Yours too, I see! 

SMTP doesn't seem to really care.  Other than the message above it still 
works no matter if you supply the "correct" domain or not.


I looked at the source code for the SMTPNOTE CLIST and see that even there 
the value is hardcoded.  Do we just need to make this somehow configurable 
and make sure we configure it with the name of the LPAR the CICS is 
running in?  Seems a bit of overkill.

Honestly, the whole requirement for a user application to actually specify 
SMTP commands seems to me to be more than a little crazy.  And in any 
case, the requirement for specifying "who I am" on the HELO is even odder. 
 Especially since (for example) the Microsoft Exchange SMTP server doesn't 
even require it:

220 ES05.firstbank.fb.ent2 Microsoft ESMTP MAIL Service ready at Tue, 2 
Sep 2014 12:39:56 -0600
HELO
250 ES05.firstbank.fb.ent2 Hello [10.100.5.50]
whereas the z/OS SMTP server does require it.  When not present the email 
is not sent and the SMTP log shows:
EZA5465E 09/02/14 12:48:53 Deleting Spool File from undetermined origin 
job number (JOB04887)


Perhaps in the end I'll just use "HELO ZOS" just like every other email 
job we have.  But I like to have things as "correct" as possible (when 
possible and not a huge amount of extra work).

Thanks,
Frank

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