DNS hiccups

Sorry for cross-posting -- mind it before replying.


Hi,

last night I sent 4 complaint messages to vodafone.com.  The first one bounced like so:

Your message to the following recipients cannot be delivered:

<[email protected]>:
  <<< No such domain.

The bounce has Date: Tue, 15 Apr 2025 05:21:45 +0200, the query log says:

15-Apr-2025 05:21:34.546 queries: info: client @0x7ff24383d168 ::1#44623 (_mta-sts.vodafone.com): view internal: query: _mta-sts.vodafone.com IN TXT + (::1)
15-Apr-2025 05:21:34.658 queries: info: client @0x7ff24383d168 ::1#54836 (vodafone.com): view internal: query: vodafone.com IN MX + (::1)
15-Apr-2025 05:21:34.686 queries: info: client @0x7ff24224d168 ::1#52645 (vodafone-com.mail.protection.outlook.com): view internal: query: vodafone-com.mail.protection.outlook.com IN AAAA + (::1)
15-Apr-2025 05:21:35.526 queries: info: client @0x7ff24224d168 ::1#56049 (vodafone-com.mail.protection.outlook.com): view internal: query: vodafone-com.mail.protection.outlook.com IN A + (::1)
15-Apr-2025 05:21:40.534 queries: info: client @0x7ff2422f9168 ::1#56049 (vodafone-com.mail.protection.outlook.com): view internal: query: vodafone-com.mail.protection.outlook.com IN A + (::1)


I guess the A queries failed.  Isn't it possible to log the return code or something?

There is no AAAA record.  The A queries seem to have timed out after 5, although in resolv.conf I have "options timeout: 10".  IIRC Courier does read resolv.conf.  Why didn't it wait 10?


This is BIND 9.18.33-1~deb12u2-Debian and courier-1.3.13.20241204.

TIA for any comment.

Best
Ale
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