RBR750 Email Logs

It is interesting that 6:00 pm CST is 12:00 am GMT.  

The RBR750 does have Advanced Setting-Advanced-Traffic Meter, but mine is disabled.  I have not made any changes to any of the Advanced settings (i.e., all factory default settings).  Metered Connections within my Windows Network Profile is also turned OFF.

Under Security-Block Sites and Block Services, both are set to "NEVER" blocking.  

Defining DNS Servers in Windows Network Properties:  This is an intriguing idea and is something I haven't tried and was completely ignorant of (i.e., I thought I had to use my ISP's DNS servers).  I believe FURRYe38 suggested the same thing but again wasn't clear on what was being suggested.  I read-up on this morning and I think I now get it.  It also appears I can enter these custom DNS server IP's (1.1.1.1, 8.8.8.8, 9.9.9.9, etc.) either within Windows Network Properties or within my RBR750 Advanced-Setup-Internet Setup-DNS Address settings.  Can you help me understand the pluses and minuses of each setting location?  Also, if I make this change on my laptop under Network Properties, will it change the DNS Server settings on all of the devices on my wifi network or just wifi traffic from my laptop (I think it is the former but want to make sure).  

       Secondly, does it make sense that this could be a DNS server issue when you consider that when I am experiencing the send error through my router and then unplug the router and connect my laptop directly to the ONT via ethernet that it then works.  I suppose it does, because when I connect directly to the ONT, the ISP DNS server is seeing a different IP address (my laptop's vs. my router's).  Does that make sense?

Could I just have a bad Orbi RBR750 (i.e., a lemon)?  Have you seen this kind of wierd behavior to find out it was some type of a hardware clitch that required a replacement or do you think this is unlikely?  

BTW, my wifi email sending has been working this morning.  I shutdown my laptop last night and turned auto send/receive off in Outlook.  My hourly Orbit logs were sent successfully throughout the night (the logs were sync'ed/downloaded in a batch this morning to my inbox); however, my Orbi log sent at 7:00 a.m. did fail with the following error (same as before):  '[email failed] resomta-h1p-027916.sys.comcast.net resomta-h1p-027916.sys.comcast.net Excessive f Wednesday, Dec 22,2021 07:00:01.'  Immediately, after seeing this log send failure, I sent a test email to myself from my outlook client at 7:04 a.m. and it did go through successfully.  The next Orbit log at 8:00 a.m. sent successfully. This has happened once before where I would get a random Orbi log email send failure, yet email sending from my laptop would continue to work properly.  

I'm going to let things ride for a while today and see what happens with the email send errors.  I will be leaving the auto send/receive turned off in outlook so as to eliminate this as a variable.  Next in the lineup is try a custom DNS server as suggested.

BTW#2, I am frequently getting "Authentication Failed" errors on ths Netgear Community website (i.e., I will attempt to post a response like this one and sometime they go through and other times I get a "Authentication Failed" response (see attached screen shot).  I wonder if this is a related problem?