17 Oct
2020
17 Oct
'20
9:59 a.m.
Hi all,
I run an e-mail server on one of my BitFolk VPSs. It seems fine except
for one oddity which has arisen lately.
Some e-mails from BT Internet customers take of the order of 3 weeks to
arrive. Looking at the headers, they move around between a couple of BT
server to begin with, then sit on the final one for up to 3 weeks before
they are delivered to my server.
I can see no failed earlier attempts to deliver in my logs, and my
server receives e-mails fine from everyone else - just BT seems to be
the problem, and not even all the e-mails coming from BT.
Anyone else seen anything like this or can suggest a likely explanation?
In case it's of relevance, BT's delivery still seems to be IPv4 only.
My server advertises both IPv6 and IPv4 addresses.
Cheers,
John
--
Xronos Scheduler - https://xronos.uk/
All your school's schedule information in one place.
Timetable, activities, homework, public events - the lot
Live demo at https://schedulerdemo.xronos.uk/
17 Oct
17 Oct
12:17 p.m.
On 2020-10-17 10:59+0100, John Winters wrote:
Some e-mails from BT Internet customers take of the
order of 3 weeks
to arrive. Looking at the headers, they move around between a couple
of BT server to begin with, then sit on the final one for up to 3
weeks before they are delivered to my server.
Personally, I'd setup a tcpdump watching BT owned netblocks on tcp/25
and see what happens. Does your mail setup log tcp connects?
Do you use greylisting?
Ed
2:55 p.m.
Hi John,
On Sat, Oct 17, 2020 at 10:59:04AM +0100, John Winters wrote:
Some e-mails from BT Internet customers take of the
order of 3 weeks to
arrive. Looking at the headers, they move around between a couple of BT
server to begin with, then sit on the final one for up to 3 weeks before
they are delivered to my server.
I've not personally seen this. The only people who could fix this or
explain what is going on are BT, I think, and they're not likely to
look into it unless asked to by one of their customers. And even
then it may be a challenge finding the right people to talk to.
If you have a copy of the full headers of something you've received
with delays, it would be interesting to see it. I (or you) could post it to
the mailop list where there are probably BT staff lurking who might
comment since it's a fairly closed forum.
https://www.mailop.org/
Cheers,
Andy
--
https://bitfolk.com/ -- No-nonsense VPS hosting
18 Oct
18 Oct
7:57 a.m.
On 17/10/2020 15:55, Andy Smith wrote:
[snip]
If you have a copy of the full headers of something
you've received
with delays, it would be interesting to see it. I (or you) could post it to
the mailop list where there are probably BT staff lurking who might
comment since it's a fairly closed forum.
Here's one. I've anonymized it a bit by changing the sender and
recipient to "sender" and "recipient" but otherwise it's
untouched.
Headers===========================================================
Envelope-to: recipient(a)sinodun.org.uk
Delivery-date: Sat, 17 Oct 2020 23:45:09 +0100
Received: from mailomta19-sa.btinternet.com ([213.120.69.25]
helo=sa-prd-fep-046.btinternet.com)
by cumulus.sinodun.org.uk with esmtps
(TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
(Exim 4.89)
(envelope-from <sender(a)btinternet.com>)
id 1kTuwh-0000IN-W3
for recipient(a)sinodun.org.uk; Sat, 17 Oct 2020 23:45:09 +0100
Received: from sa-prd-rgout-004.btmx-prd.synchronoss.net ([10.2.38.7])
by sa-prd-fep-044.btinternet.com with ESMTP
id
<20201004112406.NOUM3440.sa-prd-fep-044.btinternet.com(a)sa-prd-rgout-004.btmx-prd.synchronoss.net>
for <recipient(a)sinodun.org.uk>uk>; Sun, 4 Oct 2020 12:24:06 +0100
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btinternet.com;
s=btmx201904; t=1601810646;
bh=1vDOorT3Rx421J05dLZQyx3o5a5PSPJe4Uova3quROw=;
h=Date:Subject:Message-ID:From:To:MIME-Version;
b=nPqs/OedVuEBEbuzgyNKrmq3nbFEBng9W+2SHJNbi8IebcMzXrng/bprpUt+addyij80px6qnW5BZ//ztLYYyjZVBkbMbofAKcJOatShFOBdkKmf8OV6maPpg7x1CGwjsBm9858q7k9GUp+sdNRPtnktcX3N9ESRy6mL9BXYL1DPw6XLG51W//EoulOalYHb1UowXz4qb14+NGMNObYzya7w/OfvNJmCCOw5dG4jcqk0i9FR3wjvqbGHHPRR10PF5+nfOA+AhI/I/2oZgll09G1yKc6IW9hORiMnJyspikYpwDGCMP8xKKCcCxgKjZWomzOLgyvAe6mC/Kh6B3jPhg==
Authentication-Results: btinternet.com;
auth=pass (PLAIN) smtp.auth=sender(a)btinternet.com
X-Originating-IP: [51.198.106.191]
X-OWM-Source-IP: 51.198.106.191 (GB)
X-OWM-Env-Sender: sender(a)btinternet.com
X-VadeSecure-score: verdict=clean score=0/300, class=clean
X-RazorGate-Vade:
gggruggvucftvghtrhhoucdtuddrgedujedrgedtgdegudcutefuodetggdotefrodftvfcurfhrohhfihhlvgemuceutffkvffkuffjvffgnffgvefqofdpqfgfvfenuceurghilhhouhhtmecufedtudenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhepfffukffhvfggtgesrgdtreertddtjeenucfhrhhomhepjfcuggcuofhurhhphhihuceohhgvrghthhgvrhhmuhhrphhhhidvfedutdessghtihhnthgvrhhnvghtrdgtohhmqeenucggtffrrghtthgvrhhnpeevveduleeivdejhfdvvefgfefgueelhffhjefgteetiedvgfeftdekfefgvddthfenucffohhmrghinhepfhgrtggvsghoohhkrdgtohhmpdgtlhhiqhgtrghtvghrihhnghdrtghordhukhdpvghmmhgrshgvfigvshhfuhhlrggtrhgvshdrtghomhdpmhgrrhhkfihoohgurghrthhishhtrdgtohdruhhkpdgtlhgrrhgvshgtrghnughlvghsrdgtohhmnecukfhppeehuddrudelkedruddtiedrudeludenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhephhgvlhhopegludelvddrudeikedrtddrgegnpdhinhgvthephedurdduleekrddutdeirdduledupdhmrghilhhfrhhomhepoehhvggrthhhvghrmhhurhhphhihvdefuddtsegsthhinhhtvghrnhgvthdrtghomheqpdhrtghpthhtohepoehkrghtvgesshhinhhoughunhdrohhrghdruhhkqe
X-RazorGate-Vade-Verdict: clean 0
X-RazorGate-Vade-Classification: clean
X-SNCR-hdrdom: btinternet.com
Received: from [192.168.0.4] (51.198.106.191) by
sa-prd-rgout-004.btmx-prd.synchronoss.net (5.8.340) (authenticated as
sender(a)btinternet.com)
id 5ED9B66114297CBC for recipient(a)sinodun.org.uk; Sun, 4 Oct 2020
12:24:06 +0100
Date: Sun, 04 Oct 2020 12:23:51 +0100
Message-ID: <m40quen7b7e6hywyp8yn9a7a.1601810631098(a)email.android.com>
From: Sender <sender(a)btinternet.com>
To: Recipient <recipient(a)sinodun.org.uk>
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="--_com.android.email_414387516046343"
X-SA-Exim-Connect-IP: 213.120.69.25
X-SA-Exim-Mail-From: sender(a)btinternet.com
X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on
cumulus.sinodun.org.uk
X-Spam-Level:
X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_MED,
DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,HTML_MESSAGE,
RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_HELO_PASS,
SPF_PASS autolearn=ham autolearn_force=no version=3.4.2
Subject: =?US-ASCII?Q?Re:_[WLPM_Newsletter]_Wallingford_Lo?=
=?US-ASCII?Q?cal_Producers'_Market_3_October=0D=0A_2020?=
X-SA-Exim-Version: 4.2.1 (built Tue, 02 Aug 2016 21:08:31 +0000)
X-SA-Exim-Scanned: Yes (on cumulus.sinodun.org.uk)
End headers=======================================================
Needless to say, my mail server was up and receiving quite a lot of
e-mails daily throughout the delay period.
Cheers,
John
--
Xronos Scheduler - https://xronos.uk/
All your school's schedule information in one place.
Timetable, activities, homework, public events - the lot
Live demo at https://schedulerdemo.xronos.uk/
7:17 p.m.
On Sun, 18 Oct 2020 at 10:57, John Winters wrote:
Here's one. I've anonymized it a bit by
changing the sender and
recipient to "sender" and "recipient" but otherwise it's
untouched.
I can't find anything obvious there, but when checking the SSL of the
listed mail server for your domain (the one the MX record points to),
I noticed a certificate name mismatch:
https://ssl-tools.net/mailservers/mx.sinodun.org.uk
While I do not think this would explain the issue (I believe lots of
mail servers have misconfigured SSL), it might be worth fixing this
just in case.
Martijn
7:37 p.m.
On 18/10/2020 20:17, Martijn Grooten wrote:
[snip]
I can't find anything obvious there, but when
checking the SSL of the
listed mail server for your domain (the one the MX record points to),
I noticed a certificate name mismatch:
https://ssl-tools.net/mailservers/mx.sinodun.org.uk
While I do not think this would explain the issue (I believe lots of
mail servers have misconfigured SSL), it might be worth fixing this
just in case.
Thanks for the heads up on that. I think I've fixed it now, but can't
work out how to get that site to refresh its idea of what I'm using.
Cheers,
John
--
Xronos Scheduler - https://xronos.uk/
All your school's schedule information in one place.
Timetable, activities, homework, public events - the lot
Live demo at https://schedulerdemo.xronos.uk/
7:40 p.m.
On 18/10/2020 20:37, John Winters wrote:
[snip]
Thanks for the heads up on that. I think I've
fixed it now, but can't
work out how to get that site to refresh its idea of what I'm using.
And of course having said that I then instantly realize how to do it.
It's not enough to refresh the page - you have to click the Refresh
button within the page.
All fixed now.
J
--
Xronos Scheduler - https://xronos.uk/
All your school's schedule information in one place.
Timetable, activities, homework, public events - the lot
Live demo at https://schedulerdemo.xronos.uk/
1534
days inactive
1535
days old
6 comments
4 participants
participants (4)
-
Andy Smith -
Ed Neville -
John Winters -
Martijn Grooten