Just recently, starting on May 4th, we began bouncing some messages from Gmail with the following error:
2022-05-09 15:32:48 H=mail-lj1-x234.google.com [2a00:1450:4864:20::234]:46864 I=[2620:0:861:3:208:80:154:76]:25 X=TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256 CV=no F=<translations+caf_=jsoby=wikimedia....@wikimedia.org> rejected RCPT <js...@wikimedia.org>: Previous (cached) callout verification failure 2022-05-09 15:32:48 SMTP protocol error in "BDAT 18952 LAST" H=mail-lj1-x234.google.com [2a00:1450:4864:20::234]:46864 I=[2620:0:861:3:208:80:154:76]:25 BDAT command used when CHUNKING not advertised 2022-05-09 15:32:48 SMTP syntax error in "Received: by mail-lj1-x234.google.com with SMTP id 16so17499146lju.13" H=mail-lj1-x234.google.com [2a00:1450:4864:20::234]:46864 I=[2620:0:861:3:208:80:154:76]:25 unrecognized command 2022-05-09 15:32:48 SMTP syntax error in " for <js...@wikimedia.org>; Mon, 09 May 2022 08:32:48 -0700 (PDT)" H=mail-lj1-x234.google.com [2a00:1450:4864:20::234]:46864 I=[2620:0:861:3:208:80:154:76]:25 unrecognized command 2022-05-09 15:32:48 SMTP syntax error in "X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;" H=mail-lj1-x234.google.com [2a00:1450:4864:20::234]:46864 I=[2620:0:861:3:208:80:154:76]:25 unrecognized command 2022-05-09 15:32:48 SMTP call from mail-lj1-x234.google.com [2a00:1450:4864:20::234]:46864 I=[2620:0:861:3:208:80:154:76]:25 dropped: too many syntax or protocol errors (last command was "X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;", C=EHLO,STARTTLS,EHLO,MAIL,RCPT,BDAT,RSET,NOOP,MAIL,RCPT,BDAT) We are currently running exim 4.94 on Debian. In trying to understand the root cause of the issue I noticed a recent commit included in 4.96: JH/26 Fix CHUNKING on a continued-transport. Previously the usabliility of the the facility was not passed across execs, and only the first message passed over a connection could use BDAT; any further ones using DATA. Is this commit at all related? Is there a chance Gmail changed their sending behavior? Any insight is much appreciated, thanks, Jesse Hathaway -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
