On Tue, Nov 01, 2022 at 04:06:23PM +0000, Linkcheck wrote:
> I could only find 3 lines of log for the transaction - it was part of a
> bulk send. It appears the email was actually sent for this one; was it
> really?
Yes, the message was delivered on the second attempt.
> Oct 31 12:54:37 BRISTOLWEB postfix/smtp[35040]: A123A320136:
> to=<adminoff...@bcs.hants.sch.uk>, relay=none, delay=76,
> delays=54/1.5/20/0, dsn=4.4.3, status=deferred (Host or domain name not
> found. Name service error for name=bcs.hants.sch.uk type=MX: Host not
> found, try again)
The DNS lookup initially failed. Note that DNS for the recipient domain
is provided by "dyn.com", and if the domain employs "dynamic DNS"
intermittent issues can be expected.
> Oct 31 13:05:14 BRISTOLWEB postfix/smtp[35659]: Untrusted TLS connection
> established to
> bcs-hants-sch-uk.mail.protection.outlook.com[104.47.1.36]:25: TLSv1.2
> with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
> Oct 31 13:05:16 BRISTOLWEB postfix/smtp[35659]: A123A320136:
> to=<adminoff...@bcs.hants.sch.uk>,
> relay=bcs-hants-sch-uk.mail.protection.outlook.com[104.47.1.36]:25,
> delay=715, delays=712/0.17/0.37/2.8, dsn=2.6.0, status=sent (250 2.6.0
> <8e418a3e-a300-4529-9288-b7e8d4be8...@schoolhistoryscene.co.uk>
> [InternalId=77549929499990,
> Hostname=DBBPR03MB6969.eurprd03.prod.outlook.com] 5192716 bytes in
> 1.809, 2802.979 KB/sec Queued mail for delivery)
~10 minutes later the message was delivered.
> smtp_host_lookup = dns,native
Unless you have a good reason to include "native", you probably should
not.
--
Viktor.
