Group emails not being delivered

Hi team

I recently had to change my email provider and now emails to members-nnnnnnn@toastmastersclubs.org are not being delivered. To complicate matters my email provider only lets me know several days later, by which time the original email may already be out of date.

The diagnostic information being returned looks like this:

Hi. This is the Migadu Mailer program at smtp.migadu.com.
I'm afraid I wasn't able to deliver your message
"Assignments for Dec 11 Meeting"
to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

Intended Recipients: <members-5950177@toastmastersclubs.org>
Failure Reason: Error: Too many failures (Tried all MXs)
Original-Envelope-Id: <29CA01A8-8660-4A12-B126-E1079BAC0B42@kingsley.nz>
Reporting-MTA: dns;smtp.migadu.com
Arrival-Date: Wed, 06 Dec 2017 23:20:04 +0000

Final-Recipient: rfc822;members-5950177@toastmastersclubs.org
Action: failed
Status: 5.1.2 (550 Tried all MXstoastmastersclubs.org)
Received: (Migadu outbound); Wed, 06 Dec 2017 23:20:04 +0000
Authentication-Results: smtp.migadu.com; auth=pass (plain)
Received: from [172.20.10.2] (144-209-148-118.nzcomms.co.nz [118.148.209.144])
by smtp.migadu.com (Haraka/2.8.16) with ESMTPSA id 1B7F14A3-18C5-42F8-BE5C-E7364F0A2598.1
envelope-from <kingsley@kingsley.nz> (authenticated bits=0)
(version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 verify=FAIL);
Wed, 06 Dec 2017 23:20:02 +0000
From: Kingsley <kingsley@kingsley.nz>
Content-Type: multipart/alternative;
boundary="Apple-Mail=_E721F77C-0A2F-47A9-98E7-29980270BEC8"
Mime-Version: 1.0 (Mac OS X Mail 11.1 \(3445.4.7\))
Subject: Assignments for Dec 11 Meeting
Message-Id: <29CA01A8-8660-4A12-B126-E1079BAC0B42@kingsley.nz>
Date: Thu, 7 Dec 2017 12:19:53 +1300
To: members-5950177@toastmastersclubs.org
X-Mailer: Apple Mail (2.3445.4.7)
DKIM-Signature: v=1;a=rsa-sha256;bh=uey3Fd7c1eyrWtMGiPmTa40fUjTtJmGQArT459jtlgU=;c=relaxed/simple;d=kingsley.nz;h=from:subject:date:to;s=default;b=SwxGKccxMi+DmfnL+JntkPiQiWVvUgs2v3JfmFfqfn2PDY6UAfG3J+8lMuKmJv7WTboMlna6jgfy179LebUbkVLeqGunUrIevCvgLjt28TnwbkOWek+BkxH2QT0BwA3iGfbIAkF7WWcZI1FOcPu40PEwQxXV/ZNd5Bsm8oVFITA=

Any suggestions as to how I fix this problem will be gratefully received. BTW using the form club_name-members@... leads to the same response.

Many thanks

Kingsley

Your mail service is on the OVH netowrk home of more hackers and spammers than any other network. secondary mx server is on an ip subnet that was banned because of a hacker. I will open the IP for now but it maybe blocked again if any illegal activity happens again.

Thanks Brian

I appreciate your help

Kingsley