Starting yesterday, periodically, I've started having trouble with SOME of my emails getting bounced back. I'm not sure if it's an issue with Groups.io, my domain host's server, or somewhere else along the line. I have only rudimentary skills at breaking apart email headers and figuring out WHICH system caused the bounce. Here is one bounced message (with the actual message text deleted for brevity). "InMotionHosting" is the host for my kaser.com domain. "se3-lax1.servconfig.com" appears to be owned by InMotionHosting also. What's not clear to me is whether the error is 'happening' on the InMotionHosting system, or when trying to contact lb02.groups.io. I'm not having ANY trouble with bouncing with any of my other emails, just the ones sent to kasergames@groups.io, which is what makes me suspect something involving that link. Ideas?

Return-Path: <>
Delivered-To: everett@kaser.com
Received: from ld191.inmotionhosting.com
by ld191.inmotionhosting.com with LMTP id AHk6Lq0umlzRkz0A7wTFuQ
for <everett@kaser.com>; Tue, 26 Mar 2019 06:52:45 -0700
Return-path: <>
Envelope-to: everett@kaser.com
Delivery-date: Tue, 26 Mar 2019 06:52:45 -0700
Received: from se3-lax1.servconfig.com ([104.244.124.87]:49244)
by ld191.inmotionhosting.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256)
(Exim 4.91)
id 1h8mVR-00H14E-O2
for everett@kaser.com; Tue, 26 Mar 2019 06:52:45 -0700
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X-Failed-Recipients: kasergames@groups.io
Auto-Submitted: auto-replied
From: Mail Delivery System <Mailer-Daemon@se3-lax1.servconfig.com>
To: everett@kaser.com
Content-Type: multipart/report; report-type=delivery-status; boundary=1553608364-eximdsn-1711883849
MIME-Version: 1.0
Subject: Mail delivery failed: returning message to sender
Message-Id: <E1h8mVR-0002wE-13@se3-lax1.servconfig.com>
Date: Tue, 26 Mar 2019 09:52:45 -0400

--1553608364-eximdsn-1711883849
Content-type: text/plain; charset=us-ascii

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

kasergames@groups.io
host lb02.groups.io [173.255.221.194]
SMTP error from remote mail server after RCPT TO:<kasergames@groups.io>:
500 Invalid request

--1553608364-eximdsn-1711883849
Content-type: message/delivery-status

Reporting-MTA: dns; se3-lax1.servconfig.com

Action: failed
Final-Recipient: rfc822;kasergames@groups.io
Status: 5.0.0
Remote-MTA: dns; lb02.groups.io
Diagnostic-Code: smtp; 500 Invalid request

--1553608364-eximdsn-1711883849
Content-type: message/rfc822

Return-path: <everett@kaser.com>
Received: from ld191.inmotionhosting.com ([192.145.239.37])
by se3-lax1.servconfig.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256)
(Exim 4.89)
(envelope-from <everett@kaser.com>)
id 1h8mVI-0002qY-BE
for kasergames@groups.io; Tue, 26 Mar 2019 09:52:44 -0400
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=kaser.com;
s=default; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References:
In-Reply-To:Subject:To:Message-ID:Reply-To:From:Date:Sender:Cc:Content-ID:
Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc
:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe:
List-Post:List-Owner:List-Archive;
bh=BROU0aw90yaAdfoz1bY3qdQbEQuGXwn70HL3S+k7hMc=; b=hLNmv4TDDmYKn+Frc4F2cwZCdo
F06F5XxaC3f+t/yOIk3+sQIkPaFvklNhjyYn9c6gSfQHFJI7nTV8xR57jKDYKeN/jiFYJHY4yOUiJ
52cxjacGmJA0xukLTgmIsK1sqKF/NHqcS/UweQkykT4oyk2Fstl4/S5PyftUhdmiL8D9RGAymCRS5
wMaklnrUUm4gv8KbZjxX/5TiD/vhS5KyaV6CvvD5VeX1nLQyGn7URsxbZwEAGBlvbCzxUK2p01tHg
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by ld191.inmotionhosting.com with esmtpa (Exim 4.91)
(envelope-from <everett@kaser.com>)
id 1h8mV7-00H0sY-Ep
for kasergames@groups.io; Tue, 26 Mar 2019 06:52:35 -0700
Date: Tue, 26 Mar 2019 06:52:23 -0700
From: Everett Kaser <everett@kaser.com>
Reply-To: Everett Kaser <everett@kaser.com>
Organization: Everett Kaser Software
Message-ID: <64684569.20190326065223@kaser.com>
To: B De Roes <kasergames@groups.io>
Subject: Re: [kasergames] HLB - rel 5 - 3 image issues
In-Reply-To: <91882411.11481212.1553577266174@mail.yahoo.com>
References: <23882.1553548328917455383@groups.io> <91882411.11481212.1553577266174@mail.yahoo.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-OutGoing-Spam-Status: No, score=-100.2
X-Get-Message-Sender-Via: ld191.inmotionhosting.com: authenticated_id: everett@kaser.com
X-Authenticated-Sender: ld191.inmotionhosting.com: everett@kaser.com
X-Originating-IP: 192.145.239.37
X-SpamExperts-Domain: ld191.inmotionhosting.com
X-SpamExperts-Username: 192.145.239.37
Authentication-Results: servconfig.com; auth=pass smtp.auth=192.145.239.37@ld191.inmotionhosting.com
X-SpamExperts-Outgoing-Class: unsure
X-SpamExperts-Outgoing-Evidence: Combined (0.48)
X-Recommended-Action: accept
X-Filter-ID: EX5BVjFpneJeBchSMxfU5hxILIALfuVx7PH1GXcdrCh602E9L7XzfQH6nu9C/Fh9KJzpNe6xgvOx
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t48yp9bUmZ6K+e1mULfnZvr/lv7Gwkjin+m+
X-Report-Abuse-To: spam@se1-lax1.servconfig.com

[MESSAGE TEXT DELETED FOR BREVITY]

--1553608364-eximdsn-1711883849--

Furthermore, this group is for enhancements to groups.io.  Not for support questions.

For what it is worth, I had an identical error a couple of weeks ago
using 1&1 SMTP (any groups.io address), occurred suddenly but now seems
to have been cured while doing nothing my end. While it was failing I
used my alternative BTInternet SMTP.

I was going to contact Mark via the support line but didn't get round
to it. Yes, not really an issue for beta but Mark himself has
discusseed bounces here in the past.

Dave

On 26 Mar 2019 at 14:44, Toby Kraft wrote:

What it is saying is that server lb02.groups.io (Remote-MTA) rejected
the message for kasergames@groups.io (Final-Recipient) with error
"invalid request".

http://davesergeant.com