Hello, I am also seeing this error sending to Gmail. In our case, the client/sender seems to be using the Email client feature on a Samsung android mobile and it happens when used on German language. I tested this locally on my own Samsung and had the same result.
Is a non-English language also being used for your case or also related to an Android app? Sincerely, Jose -----Original Message----- From: "John Stephenson via mailop" <mailop@mailop.org> Sent: Wednesday, November 9, 2022 8:47am To: "Brandon Long" <bl...@google.com> Cc: mailm...@ionos.gr, mailop@mailop.org Subject: Re: [mailop] "header is missing" at Gmail _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop I appreciate the feedback from you both! I'll see if this is something we can confirm/exclude. J On Tue, Nov 8, 2022 at 3:15 PM Brandon Long via mailop <mailop@mailop.org> wrote: > Another one I've seen is an extra newline which ends the headers, ie: > > Subject: foo > To: b...@example.net > > From: campa...@example.org > > I don't recall how annoying our parser is, whether something like this > would also cause early end of headers: > > Subject: foo > To: bar@ > example.net > From: campa...@example.org > > Brandon > > On Tue, Nov 8, 2022 at 2:15 PM Mary via mailop <mailop@mailop.org> wrote: > >> >> I've seen this before, when the header above the From header is broken: >> >> Authentication-Results: server; >> dkim=blah reason="blah"; >> From: "Valid" <addr...@example.tld> >> To: mailop <mailop@mailop.org> >> >> >> The parser thinks that the From: header is part of the previous header, >> thus ignoring it and ending with a missing header error. >> >> >> >> On Tue, 8 Nov 2022 13:41:57 -0800 John Stephenson via mailop < >> mailop@mailop.org> wrote: >> >> > We've seen the below failure for two different clients (each in one >> > specific campaign) which resulted in lots of these failures at Gmail for >> > those respective campaigns. Our Support/Ops team continue to insist >> that >> > we sent these campaigns with the same exact from address/header/domain >> set >> > up as all of the other campaigns launched on this day and that the issue >> > must be on Gmail's side. >> > I'm praying that somebody here has had experience with this failure and >> > tracked down some subtle/quirky reason why an otherwise reliable sending >> > MTA would encounter this failure? >> > >> > Best, >> > >> > John >> > >> > >> > 550-5.7.1 [142.54.247.27] Our system has detected that this message is >> not >> > RFC\r\n550-5.7.1 5322 compliant:\r\n550-5.7.1 'From' header is >> > missing.\r\n550-5.7.1 To reduce the amount of spam sent to Gmail, this >> > message has been\r\n550-5.7.1 blocked. Please visit\r\n550-5.7.1 >> > https://support.google.com/mail/?p=RfcMessageNonCompliant\r\n550 5.7.1 >> and >> > review RFC 5322 specifications for more information. >> _______________________________________________ >> mailop mailing list >> mailop@mailop.org >> https://list.mailop.org/listinfo/mailop >> > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop > _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
