Hello John, Tobias, Thank you for your answers. I was not favoring the DNS. * On my mail server # dig google.fr mx
; <<>> dig 9.10.8-P1 <<>> google.fr mx ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1014 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 5 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1232 ;; QUESTION SECTION: ;google.fr. IN MX ;; ANSWER SECTION: google.fr. 300 IN MX 0 smtp.google.com. ;; ADDITIONAL SECTION: smtp.google.com. 278 IN AAAA 2a00:1450:400c:c02::1a smtp.google.com. 278 IN AAAA 2a00:1450:400c:c07::1b smtp.google.com. 278 IN AAAA 2a00:1450:400c:c08::1a smtp.google.com. 278 IN AAAA 2a00:1450:400c:c08::1b # dig smtp.google.com aaaa ; <<>> dig 9.10.8-P1 <<>> smtp.google.com aaaa ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 9990 ;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1232 ;; QUESTION SECTION: ;smtp.google.com. IN AAAA ;; ANSWER SECTION: smtp.google.com. 300 IN AAAA 2a00:1450:400c:c07::1b smtp.google.com. 300 IN AAAA 2a00:1450:400c:c02::1a smtp.google.com. 300 IN AAAA 2a00:1450:400c:c08::1b smtp.google.com. 300 IN AAAA 2a00:1450:400c:c08::1a Then on my DNS I log the queries11-Jan-2023 22:48:01.846 client @0xf4ff7212d0 10.mailserverIP#40443 (gmail.com): query: gmail.com IN MX + (10.dnserverIP)11-Jan-2023 22:48:01.854 client @0xf4ff7212d0 10.mailserverIP #32810 (alt2.gmail-smtp-in.l.google.com): query: alt2.gmail-smtp-in.l.google.com IN A + (10.dnserverIP)11-Jan-2023 22:48:01.854 client @0xf571e5f2d0 10.mailserverIP #17570 (gmail-smtp-in.l.google.com): query: gmail-smtp-in.l.google.com IN A + (10.dnserverIP)11-Jan-2023 22:48:01.855 client @0xf4a58892d0 10.mailserverIP #14392 (alt1.gmail-smtp-in.l.google.com): query: alt1.gmail-smtp-in.l.google.com IN A + (10.dnserverIP)11-Jan-2023 22:48:01.855 client @0xf5223412d0 10.mailserverIP #31444 (alt4.gmail-smtp-in.l.google.com): query: alt4.gmail-smtp-in.l.google.com IN A + (10.dnserverIP)11-Jan-2023 22:48:01.856 client @0xf4df0972d0 10.mailserverIP #1669 (alt3.gmail-smtp-in.l.google.com): query: alt3.gmail-smtp-in.l.google.com IN A + (10.dnserverIP)11-Jan-2023 22:48:01.869 client @0xf571e5f2d0 10.mailserverIP #10862 (gmail-smtp-in.l.google.com): query: gmail-smtp-in.l.google.com IN AAAA + (10.dnserverIP)11-Jan-2023 22:48:01.876 client @0xf5223412d0 10.mailserverIP #11052 (alt2.gmail-smtp-in.l.google.com): query: alt2.gmail-smtp-in.l.google.com IN AAAA + (10.dnserverIP)11-Jan-2023 22:48:01.877 client @0xf4a58892d0 10.mailserverIP #31097 (alt1.gmail-smtp-in.l.google.com): query: alt1.gmail-smtp-in.l.google.com IN AAAA + (10.dnserverIP)11-Jan-2023 22:48:01.877 client @0xf4ff7212d0 10.mailserverIP #15242 (alt4.gmail-smtp-in.l.google.com): query: alt4.gmail-smtp-in.l.google.com IN AAAA + (10.dnserverIP)11-Jan-2023 22:48:01.878 client @0xf5336c82d0 10.mailserverIP #1836 (alt3.gmail-smtp-in.l.google.com): query: alt3.gmail-smtp-in.l.google.com IN AAAA + (10.dnserverIP) On my mail server logs I can see that IPv6 is not used Jan 11 22:47:56 mailserver smtpd[20101]: 3c9017a91b90aff8 smtp connected address=127.0.0.1 host=localhost Jan 11 22:47:56 mailserver smtpd[20101]: 3c9017a91b90aff8 smtp message msgid=d1edf87d size=1104 nrcpt=1 proto=ESMTP Jan 11 22:47:56 mailserver smtpd[20101]: 3c9017a91b90aff8 smtp envelope evpid=d1edf87d4087c230 from=<myu...@mydomain.org> to=<usert...@gmail.com> Jan 11 22:47:56 mailserver smtpd[20101]: 3c9017a91b90aff8 smtp disconnected reason=quit Jan 11 22:47:56 mailserver smtpd[20101]: 3c9017ac667d462b mta connecting address=smtp://127.0.0.1:10025 host=localhost Jan 11 22:47:56 mailserver smtpd[20101]: 3c9017ac667d462b mta connected Jan 11 22:47:56 mailserver clamsmtpd: 100181: accepted connection from: 127.0.0.1 Jan 11 22:47:56 mailserver smtpd[20101]: 3c9017ada88be21f smtp connected address=127.0.0.1 host=localhost Jan 11 22:47:56 mailserver smtpd[20101]: 3c9017ada88be21f smtp message msgid=da09c4a0 size=1339 nrcpt=1 proto=ESMTP Jan 11 22:47:56 mailserver smtpd[20101]: 3c9017ada88be21f smtp envelope evpid=da09c4a09c71da8f from=<myu...@mydomain.org> to=<usert...@gmail.com> Jan 11 22:47:56 mailserver smtpd[20101]: 3c9017ac667d462b mta delivery evpid=d1edf87d4087c230 from=<myu...@mydomain.org> to=<usert...@gmail.com> rcpt=<-> source="127.0.0.1" relay="127.0.0.1 (localhost)" delay=0s result="Ok" stat="250 2.0.0 da09c4a0 Message accepted for delivery" Jan 11 22:47:56 mailserver clamsmtpd: 100181: from=myu...@mydomain.org, to=usert...@gmail.com, status=CLEAN Jan 11 22:48:01 mailserver smtpd[20101]: 3c9017af9e152f41 mta connecting address=smtp://127.0.0.1:10029 host=localhost Jan 11 22:48:01 mailserver smtpd[20101]: 3c9017af9e152f41 mta connected Jan 11 22:48:01 mailserver smtpd[20101]: 3c9017b0b9b5ff23 smtp connected address=127.0.0.1 host=localhost Jan 11 22:48:01 mailserver dkimproxy.out[53636]: DKIM signing - signed; message-id=<05793887b3def150dcc2054d56510...@mydomain.org>, signer=<myu...@mydomain.org>, from=<myu...@mydomain.org> Jan 11 22:48:01 mailserver smtpd[20101]: 3c9017b0b9b5ff23 smtp message msgid=9e291457 size=2269 nrcpt=1 proto=ESMTP Jan 11 22:48:01 mailserver smtpd[20101]: 3c9017b0b9b5ff23 smtp envelope evpid=9e29145712d79b97 from=<myu...@mydomain.org> to=<usert...@gmail.com> Jan 11 22:48:01 mailserver smtpd[20101]: 3c9017af9e152f41 mta delivery evpid=da09c4a09c71da8f from=<myu...@mydomain.org> to=<usert...@gmail.com> rcpt=<-> source="127.0.0.1" relay="127.0.0.1 (localhost)" delay=5s result="Ok" stat="250 2.0.0 9e291457 Message accepted for delivery" Jan 11 22:48:01 mailserver smtpd[20101]: 3c9017b3991746f4 mta connecting address=smtp://64.233.184.27:25 host=wa-in-f27.1e100.net Jan 11 22:48:01 mailserver smtpd[20101]: 3c9017b3991746f4 mta connected Jan 11 22:48:01 mailserver smtpd[20101]: 3c9017b3991746f4 mta tls ciphers=TLSv1.3:TLS_AES_256_GCM_SHA384:256 Jan 11 22:48:01 mailserver smtpd[20101]: 3c9017b3991746f4 mta cert-check result="unverified" fingerprint="SHA256:c52373769af03068082fccc8a93a45de2aef4ad6d6e279020dfc73b7373d720c" Jan 11 22:48:02 mailserver smtpd[20101]: 3c9017b3991746f4 mta delivery evpid=9e29145712d79b97 from=<myu...@mydomain.org> to=<usert...@gmail.com> rcpt=<-> source="10.mailserverIP" relay="64.233.184.27 (wa-in-f27.1e100.net)" delay=1s result="Ok" stat="250 2.0.0 OK 1673473682 i22-20020a05600c355600b003cf484ba59dsi18528521wmq.122 - gsmtp" Jan 11 22:48:06 mailserver smtpd[20101]: 3c9017ada88be21f smtp disconnected reason=quit The last rules in my configuration areaction VERS-DKIM_OUT relay host smtp://127.0.0.1:10029 match from local tag CLAM_OUT for any action VERS-DKIM_OUT action RELAIE relay match from local tag DKIM_SIGNE for any action RELAIE Does opensmtpd favors IPv6 over IPv4 or does it favor IPv4 ? Regards Le mercredi 11 janvier 2023 à 20:11:47 UTC+1, John Batteen <j...@batteen.com> a écrit : When I've run into this before, it was DNS. My resolver needed to be configured to default to ipv6 responses. Not sure that will fix your issue but it's a place to look. Good luck, John On 1/10/2023 8:20 PM, Mik J wrote: Hello, My server has an IPv6 adress and is able to contact gmail mail server $ telnet 2a00:1450:400c:c0a::1a 25 Trying 2a00:1450:400c:c0a::1a... Connected to 2a00:1450:400c:c0a::1a. Escape character is '^]'. 220 mx.google.com ESMTP q7-20020a05600c46c700b003d9f3cf68d3si5203102wmo.92 - gsmtp I relay using this rule action RELAIE relay match from local tag DKIM_SIGNE for any action RELAIE But when I look at my logs, the mails are sent over IPv4 smtpd[30274]: 79ebd464bef0b2e0 mta delivery evpid=d2651839f3f0795f from=<myu...@mydomain.org> to=<usert...@gmail.com> rcpt=<-> source="10.1.2.2" relay="142.251.5.27 (wg-in-f27.1e100.net)" delay=1s result="Ok" stat="250 2.0.0 OK 1673402672 g14-20020adfa48e000000b00285261d0e19si12019405wrb.385 - gsmtp" Any idea why this would happen ? version: OpenSMTPD 7.0.0