Hi.
We have test environment showing at picture above.
1 test. UserA sends email to userB, he sees that email contains Date header with offset (according to userA timezone I suppose): Date: Tue, 28 Aug 2018 17:31:07 +0300
2 test. UserA or userB sends email to SMTP1 or SMTP2 (email to domain the hold) they receive email with Date header in UTC format: Date: Tue, 28 Aug 2018 12:32:22 +0000
3 test. SMTP1 sends email to SMTP2 via exchange: SMTP1->EXCHANGE mail box with forwarding->SMTP2. SMTP2 server receives email with Date header which was originally generated by SMTP1 in SMTP transaction: Date: Tue, 28 Aug 2018 17:31:07 +0300
All servers and client OS have correct locale and timezones configured as userA and userB mailboxes.
I mean Date header explained here
https://tools.ietf.org/html/rfc2822#section-3.6.1
My question is how date header actually formed when outlook construct email? Whose timezone it uses?
Microsoft doesn't have docs about this process. Internet doesn't have much info about this question only fragmentary pieces.
Hoped to find any official MS info about this.