What level z/OS? SMPT or CSSMPT? I would suspect a need to further configure 
due to some newer gmail requirements. Probably only available using CSSMPT

> -----Original Message-----
> From: IBM Mainframe Discussion List <[email protected]> On
> Behalf Of Charles Mills
> Sent: Sunday, December 11, 2022 10:29 AM
> To: [email protected]
> Subject: Why email from z/OS SMTP rejected by Gmail?
> 
> [EXTERNAL EMAIL]
> 
> Has anyone else seen this? I have a couple of z/OS applications that send
> status emails. The emails go to several addresses without error. Some of the
> emails are plain text format, and some are HTML.
> 
> I recently added an @Gmail address to the emails and the plain text email
> *only* is being rejected by Gmail with the following error:
> 
> host gmail-smtp-in.l.google.com[142.251.15.26] said:
>     550-5.7.1 [66.180.7.182] Messages missing a valid messageId header are
> not
>     550 5.7.1 accepted. 4-
> 20020a250404000000b006de730f5057si5474769ybe.296 -
>     gsmtp (in reply to end of DATA command)
> 
> Here is an example – pretty much straight out of the IP User’s Guide – that
> duplicates the problem. The @mcn address works but the @gmail address
> bounces. Has anyone else seen this? Any ideas?
> 
> //IEBGENER EXEC PGM=IEBGENER
> //SYSIN DD DUMMY
> //SYSUT1 DD *
> HELO server
> MAIL FROM:<[email protected]>
> RCPT TO:<[email protected]>
> RCPT TO:<[email protected]>
> DATA
> Importance: high
> From: LPAR<[email protected]>
> To: <[email protected]>
> To: <[email protected]>
> Subject: Please tell me if you get this email!!!
> 
> Mike: Cindy stubbed her toe. Bobby went to
> baseball camp. Marsha made the cheerleading team.
> Jan got glasses. Peter has an identity crisis.
> Greg made dates with 3 girls and couldn't
> remember their names.
> .
> QUIT
> /*
> //SYSUT2 DD SYSOUT=(B,SMTP)
> //SYSPRINT DD SYSOUT=*
> 
> Thanks,
> Charles
> 
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