•1 year ago
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Whitelist Data and Links. Before you begin phishing and training your users, you must whitelist. It is extremely important that you whitelist us in order to prevent our phishing security test emails and training notifications from being blocked or filtered into your Spam folder. You can add Advanced Threat Protection Plan 1 to the following Exchange and Office 365 subscription plans: Exchange Online Plan 1, Exchange Online Plan 2, Office 365 F1, Office 365 Business Essentials, Office 365 Business Premium, Office 365 Enterprise E1, Office 365 Enterprise E3, Office 365 Enterprise E5, Office 365 Education.
So I'm running Exchange 2010 and I've got 1 particular recipient domain that we're having problems sending email to. It might be something just on their end that I have no control over, but I wanted to see if you experts could help a guy out:
When running a MX Lookup on MX Toolbox on that domain, they show 3 MX records, mx.zoho.com (pref 10), mx2.zoho.com (pref 20), and mail.<nameofdomain>.com (pref 30). The Zoho ones look fine. It's the 3rd one that is weird. It has {No A Record} and it's pref is 30. No biggie to me. I don't manage that domain, so I would think that my mail from here would try to deliver to one of the Zoho's first. But try as I might, I can't send email to this domain at all. It sits 'queued for delivery' for several days, then eventually you receive a #< #5.0.0 smtp; 5.4.7 - Delivery expired (message too old) 'timeout' (delivery attempts: 0)> #SMTP#
I can't figure out if there's a way to get my email server (or my IronPort) to stop trying to deliver to the non-zoho record and chose pref 10 or 20.
Feel free to ask other questions if you need. This is where I am. Thanks in advance!
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