…Almost identical issue here too:

We have hosted our own LISTSERV environment on-prem for almost two decades now. As of about 2 months ago all of a sudden no external partners can post on our lists either but, can receive from those same lists. Our mail exchange has been using …mail.protection.outlook.com for the last several years. I’ve spent the last 2 months troubleshooting with numerous Microsoft engineers and we’re just going in circles.

Thanks,
Eli Phelps

______________________________________________________
Eli Phelps

Sys Programmer/Analyst III

AFH Ntwrk Systems Spprt Srvcs

ECU | Information Technology & Computing Services (ITCS)
209 Cotanche St. | Office Cotanche 101 | Mail Stop 229

Greenville, NC 27858-1125

Office: 252-737-4732 | [log in to unmask] | ecu.edu/itcs

_______________________________________________________

Work Shift: M-F 7:00-4:00 EDT/EST; Lunch ~12:00-1:00

Reach me online via [log in to unmask]">Teams or Webex.

Book time with me or our team. (no solicitation)

From: LISTSERV Site Administrators' Forum <[log in to unmask]> On Behalf Of ? Nick Abiola-Bisiolu
Sent: Tuesday, June 14, 2022 9:24 AM
To: [log in to unmask]
Subject: Re: configuring LISTSERV to work with Amazon Simple Email Service (SES)

This email originated from outside ECU.

Instead of using Amazon SES as your Listserv email gateway why not route the traffic to your domain gateway SMTP server to handle the outbound traffic. I noticed that your email is primary host is Microsoft Outlook. They might have a service similar to Google SMTP Gateway to support your domain SMTP traffic.

Our Listserv is hosted on Amazon AWS and forwarded all outbound emails to our Google SMTP gateway successfully for many years now.

Regards,

Nick

IEEE

On Tue, Jun 14, 2022 at 9:14 AM Richter, Andy <[log in to unmask]> wrote:

We have LISTSERV configured to work properly with Amazon Simple Email Service for messages that originate from Vanderbilt.edu. However, all of our LISTSERV messages that originate from our external partners are being blocked because we are unable to verify their email addresses to Amazon SES. If you have LISTSERV fully working with Amazon SES, I would appreciate any advice on what I need to do to make it fully work for Vanderbilt University.

Andy Richter
Senior System Administrator, Hosting Services
Information Technology | Vanderbilt University
615.343.4518 | [log in to unmask]

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