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([2a02:810d:aabf:f708:694e:f808:9774:99c4]) by smtp.googlemail.com with ESMTPSA id p6sm6517506wrx.50.2018.12.14.02.56.44 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 14 Dec 2018 02:56:45 -0800 (PST) From: thorsten23 X-Google-Original-From: thorsten23 To: freebsd-questions@freebsd.org Subject: =?UTF-8?Q?IPv6_enabled_sendmail_does_not_send_to_domains_with_IPv4_?= =?UTF-8?Q?only_MX_which_results_in_=e2=80=9cconfig_error=3a_mail_loops_back?= =?UTF-8?B?IHRvIG1l4oCd?= Openpgp: preference=signencrypt Autocrypt: addr=thorsten23@gmail.com; prefer-encrypt=mutual; keydata= xsBNBFEE/XYBCACyC5WZLsKPzVY+Mzc9MNIHTHEF67lE0FuOFnYjz5Ote65Pl60FAQE5MROu W9GteaB5L6HJ7WymqfnZdNQ0VA3qgwNeejm30vacMlak3XOeUTlv2tLMvNxyyad8iBjpSCzp Z7uXh5ixInZTBUbw+8UVpMZtibzKBvh8SYyVDlNLVxC6t0w+jDGwzE40OuMTymFtn3JDFr6s KF6jyl382WjyV34hum2A14GqXbvi7v2xHxCJIhfXWEofOZ/2FJ1Nni+frcS1yYpOMft2uCSw dfGZSiN5WcGHD6ViROOqbMREd5yiZMsxk/GBitz/YlLOi3aHj5SZw2sLOIIkjWl+Urr7ABEB AAHNIXRob3JzdGVuMjMgPHRob3JzdGVuMjNAZ21haWwuY29tPsLAeAQTAQIAIgUCUQT9dgIb AwYLCQgHAwIGFQgCCQoLBBYCAwECHgECF4AACgkQqUodjy/Pyw+uDQf8DWG3uAxunif4N9aM 3tgelgp966fHTiSn85gJ6XevJdBXtWuq4y8n5WjS0JISVUbacXCijDOdo8uehluwjK/OMLWX 3+QOR1g3G3uxieSpy749jFWA+c/sT6HRxsKhDk1DhKxchnDt3yBwJ4P5/uWjbNfRnJDHBbK3 hcxHZsOT3ZtlxeAf3AqOYcnOkUvj32LwnCvKRX0REZcbFVJ7Sr8G4knfEg7IpzuqfHJrEw8j Ve3d9D1yQWfpPYU5e5tu6+aK+sVM3deOecDEEh5u4iW1OTjwd6DqztZPMPKK3fHuHBHZNdd5 SZPTgVp5MbXO8K6cDeVO1byiiRGjK4w3OUSM5c7ATQRRBP12AQgA6kcr+9u/UIW0K68b4tIh /lclF1fLqB6xZl7ohdOvvIqsU4iMRHO0h0PPXRjrXKmA2WMUvg07QAyHWc2OyM/0H4z/C2Yx m4eK0DTPpyq+d6fpUXEz9suAGkH9zuqnMFcWDNzQV3uTH8oFCvXeoYEHUMWmK1u5gDV7WMTL KRgk6kghMV6+cGhsVubPmsZxTenXHwc++mANayZwJh6NCwJ1VNRsFWR+mWTxtj82rzcymYuq Rd62NXHWkAqhZMEjIqvMA9UX6iHrVP0cl5LWbJwLdgLwONe5T8pLGBvUSN6t4YrsDbtZT+cd c/QYlspK/KnWyOxBanifa922J4wroO9QtQARAQABwsBfBBgBAgAJBQJRBP12AhsMAAoJEKlK HY8vz8sP8DEH/2snlz7kAgjf4xwKkj6vUjv5jUPCntyRoUSj0ZIj8V2opXR/Hvo4HgxuB36Q G7sbMQ0Xake1lYX9WpZwgsLEV2kWFWZCuI6YcBfGPFjznIuiAj0ikom2dMI5bN02dyhYAeso USyWyoyce5WY2R0EhUPQXRqM0WGwearpAJC4a870AIlF7VcRMIfjjHmU+iKpxKUZMQV/3ges wT89sQ3gMLt5xC2K18xpbvvxqammhFvfxxiLeqrdtmCckhM2FdaM70KYRotf1gD6EXEU5j2e Lr2BlI4Uzjc3sSASwedsJ36KEzMTGKI0iH+7eJ3WPXXu7c/t4jh7XlsH4Gf5sbK8f54= Message-ID: Date: Fri, 14 Dec 2018 11:56:44 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.2 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: E8C1F6ABFF X-Spamd-Bar: ----- X-Spamd-Result: default: False [-5.28 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[googlemail.com:s=20161025]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; FREEMAIL_FROM(0.00)[googlemail.com]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; TO_DN_NONE(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; RCVD_COUNT_THREE(0.00)[3]; IP_SCORE(-2.30)[ip: (-8.56), ipnet: 2a00:1450::/32(-1.53), asn: 15169(-1.32), country: US(-0.09)]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_TRACE(0.00)[googlemail.com:+]; MX_GOOD(-0.01)[cached: alt3.gmail-smtp-in.l.google.com]; DMARC_POLICY_ALLOW(-0.50)[googlemail.com,quarantine]; RCVD_IN_DNSWL_NONE(0.00)[e.2.4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.5.4.1.0.0.a.2.list.dnswl.org : 127.0.5.0]; NEURAL_HAM_SHORT(-0.97)[-0.972,0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[googlemail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; RCVD_TLS_LAST(0.00)[]; DWL_DNSWL_NONE(0.00)[googlemail.com.dwl.dnswl.org : 127.0.5.0] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Dec 2018 10:56:48 -0000 I encountered a strange problem after enabling IPv6 on my sendmail. BTW, reverse resolution is fine for my domain A and AAAA wise. Sending mail to a domain with MX A and AAAA records switched now from IPv4 to IPv6. e.g with gmail: sm-mta[42339]: wBE9nxJl042337: to=, ctladdr= (1001/1001), delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=30389, relay=gmail-smtp-in.l.google.com. [IPv6:2a00:1450:400c:c06:0:0:0:1b], dsn=2.0.0, stat=Sent but sending mail to a domain with only MX A records does not take that IPv4 address for the relay but replaces it with my own servers IPv6 address which results in the "config error: mail loops back to me (MX problem?)" error. e.g. with gmx.net: sm-mta[42369]: wBE9oqO5042367: to=, ctladdr= (1001/1001), delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=30390, relay=mx00.emig.gmx.net. [IPv6:myservers_IPv6_Address!!!here should be the IPv4 address of the mx00.emig.gmx.net!!!], dsn=5.3.5, stat=Local configuration error which furthermore leads to the "loops back to me" error. That's what I added to sendmail.mc: DAEMON_OPTIONS(`Name=MTA-v6, Family=inet6') How can a IPv4 and IPv6 enabled sendmail communicate with IPv4 only MX of a foreign domain? Why doesn't it resolve the MX's IPv4 address but instead uses it's own IPv6 address? DNS resolv works fine.