The last error Gmail gave me blames Collins, and I saw the same error in
someone else's note.

(example follows)

- The last reported error was: 5.7.1 550-5.7.1 Unauthenticated email from
collins.com  is not  accepted  due to  domain's  550-5.7.1 DMARC  policy.
Please contact the administrator of  collins.com domain 550-5.7.1 if this
was a legitimate mail. Please visit 550-5.7.1
https://support.google.com/mail/answer/2451690 to learn about the 550 ...
(52 bytes suppressed)

Here is the short easy explanation of DMARC
https://dmarc.org/wiki/FAQ#How_does_DMARC_work.2C_briefly.2C_and_in_non-technical_terms.3F

Someone's emails are failing DMARC, which is resulting in many people's
email servers rejecting the message. It is possible that the IPC DMARC
policy is being applied to the Collins email address, but I think more
likely the Collins DMARC policy is either malformed for mailing list type
emails, or is being applied to the message after it has passed through the
IPC server.

It's worth investigation on both the IPC and Collins end... and if anyone
saw different errors (or the same error referencing a different domain)
please post them, I'm sure it will help diagnose the issue.

t

On Fri, Dec 7, 2018 at 11:20 AM David Bergman <[log in to unmask]> wrote:

> I will ask our IT to look into this . Numbers seem too high.
>
> David W. Bergman
> Vice President, Standards & Training
> IPC - Association Connecting Electronics Industries
> 3000 Lakeside Drive Suite 105N
> Bannockburn, IL 60015-1249 USA
> +1 847-597-2840<tel:+1%20847-597-2840> tel
> +1 847-615-5640<tel:+1%20847-615-5640> fax
> +1 847-867-1388<tel:+1%20847-867-1388> mobile
> [log in to unmask]<mailto:[log in to unmask]>
> Skype: davidbergmanipc
> www.ipc.org<http://www.ipc.org/>
>
>
> On Dec 7, 2018, at 8:15 AM, Drew A. Meyer <[log in to unmask]<mailto:
> [log in to unmask]>> wrote:
>
> Guy,
>
> Just got booted myself!  My IT departments response was subscribe again.
> It appears that some software guarding the email is rejecting some TechNet
> emails.  After so many rejected emails TechNet un-subscribes the user.
> Unless something changes on my end I suspect I will be un-subscribed again
> shortly.  According to the note from TechNet it only took seven days for me
> to accumulate enough rejected emails to be un-subscribed.
>
> Drew
>