Today a fellow postmaster (using Exim) called me, they were having problems sending mail to charite.de. In my log I found:
Sep 3 00:31:18 mail-cbf postfix/postscreen[34943]: CONNECT from [31.7.179.105]:38256 to [193.175.73.208]:25 Sep 3 00:31:24 mail-cbf postfix/tlsproxy[39995]: CONNECT from [31.7.179.105]:38256 Sep 3 00:31:24 mail-cbf postfix/tlsproxy[39995]: Anonymous TLS connection established from [31.7.179.105]:38256: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) Sep 3 00:31:24 mail-cbf postfix/postscreen[34943]: NOQUEUE: reject: RCPT from [31.7.179.105]:38256: 450 4.3.2 Service currently unavailable; from=<sen...@medtravel.de>, to=<recipi...@charite.de>, proto=ESMTP, helo=<smtpgw03.nextwerk.de> Sep 3 00:31:24 mail-cbf postfix/postscreen[34943]: COMMAND PIPELINING from [31.7.179.105]:38256 after BDAT: Received: from [213.182.136.75] (helo=NWH-EX13.nwcloud.loc)\r\n\tby smtpgw03.nextwerk.de with esmtpsa ( After I disabled chunking, mail would flow again. Is this an Exim issue or a flaw in the newly introduced BDAT feature? -- [*] sys4 AG https://sys4.de, +49 (89) 30 90 46 64 Schleißheimer Straße 26/MG, 80333 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
