Hi Thanks for replay I found "RFC 822 Message-ID is not required" Probably "problem" is in configurations in some clients.
On 23.11.2020 14:39, Matus UHLAR - fantomas wrote: > On 23.11.20 14:35, natan wrote: >> I have probably to trivial questions about message-ID >> >> Why sometimes, some user have empty message-id=<> >> >> example: >> Nov 23 13:13:53 smtp1 postfix/submission/smtpd[29867]: 4CfmKF1CSDz5MwK: >> xxxx.domain.ltd[xxx.xxx.xxx.xxx], sasl_method=login, >> sasl_username=bi...@domain2.ltd >> Nov 23 13:13:53 smtp1 postfix/cleanup[46909]: 4CfmKF1CSDz5MwK: >> message-id=<> >> Nov 23 13:13:53 smtp1 postfix/qmgr[25287]: 4CfmKF1CSDz5MwK: >> from=<bi...@domain2.ltd>, size=94874, nrcpt=3 (queue active) >> ..... > > client's MUA apparently does not generate Message-Id: header. >
