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  • Sending email fails if domain found.

    From Nigel Reed@VERT to GitLab issue in main/sbbs on Sun Nov 7 08:27:22 2021
    open https://gitlab.synchro.net/main/sbbs/-/issues/303

    Even though an MX address exists for sysadmininc.com, an A or AAAA record does not. The email should still be delivered.

    Nov 7 02:16:16 bbs synchronet: mail 0000 SEND last_msg=9879, smb.status.last_msg=9880, elapsed=633
    Nov 7 02:16:16 bbs synchronet: mail 0000 SEND Message #9879 (671 of 672) from <nigel@nigelreed.net> to '' <nigel@sysadmininc.com>
    Nov 7 02:16:16 bbs synchronet: mail 0000 SEND getting message text
    Nov 7 02:16:16 bbs synchronet: mail 0000 SEND using auto-detected DNS server address: 2001:4860:4860::8844
    Nov 7 02:16:16 bbs synchronet: mail 0000 !SEND INVALID DNS server address: 2001:4860:4860::8844
    Nov 7 02:16:16 bbs synchronet: mail 0000 SEND Message #9880 (672 of 672) from <nigel@nigelreed.net> to '' <nigel@sysadmininc.com>
    Nov 7 02:16:16 bbs synchronet: mail 0000 SEND getting message text
    Nov 7 02:16:16 bbs synchronet: mail 0000 SEND using auto-detected DNS server address: 8.8.8.8
    Nov 7 02:16:16 bbs synchronet: mail 0000 SEND getting MX records for sysadmininc.com from 8.8.8.8
    Nov 7 02:16:16 bbs synchronet: mail 0133 SEND resolving SMTP hostname: sysadmininc.com
    Nov 7 02:16:16 bbs synchronet: mail 0133 SEND !Failure resolving hostname: sysadmininc.com
    Nov 7 02:16:16 bbs synchronet: mail 0133 SEND !Delivery attempt #1 FAILED (Error resolving hostname sysadmininc.com) for message #9880 from nigel to nigel@sysadmininc.com

    $ dig @8.8.8.8 sysadmininc.com mx +short
    bbs@bbs:~$ dig @8.8.8.8 sysadmininc.com mx

    ; <<>> DiG 9.16.1-Ubuntu <<>> @8.8.8.8 sysadmininc.com mx
    ; (1 server found)
    ;; global options: +cmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 60603
    ;; flags: qr rd ra ad; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

    ;; OPT PSEUDOSECTION:
    ; EDNS: version: 0, flags:; udp: 512
    ;; QUESTION SECTION:
    ;sysadmininc.com. IN MX

    ;; ANSWER SECTION:
    sysadmininc.com. 3600 IN MX 0 www.sysadmininc.com. sysadmininc.com. 3600 IN MX 10 ipv6.sysadmininc.com.

    ;; Query time: 55 msec
    ;; SERVER: 8.8.8.8#53(8.8.8.8)
    ;; WHEN: Sun Nov 07 02:25:39 CST 2021
    ;; MSG SIZE rcvd: 85

    both the MX addresses resolve fine.

    This is happening when using sbbs as a relay (incoming via ipv6). Not sure about other situations.

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