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I ended up refunding one of the Orders based on the email rejection and apparently the recipient received the Refund Notice email through BC. I responded to them and the response (generated from my desktop did not get rejected).
This is the error explanation by Google for the rejection (for both gmail rejections):
"550 5.7.1 Our system has detected an unusual amount of unsolicited mail originating from your IP address. To protect our users from spam, mail sent from your IP address4 has been rejected/temporarily blocked."
Here is the actual info from the email source:
Remote-MTA: dns; gmail-smtp-in.l.google.com
Remote-MTA: X-ip; [18.104.22.168]
X-Remote-MTA-smtp-greeting: X-str; 220 mx.google.com ESMTP x9si120270qkf.220 - gsmtp
X-Remote-MTA-helo-response: X-str; 250-mx.google.com at your service, [22.214.171.124]
X-Exim-Diagnostic: X-str; SMTP error from remote mail server after end of data: 550-5.7.1 This message does not have authentication information or fails to pass\n550-5.7.1 authentication checks. To best protect our users from spam, the\n550-5.7.1 message has been blocked. Please visit\n550-5.7.1 https://support.google.com/mail/answer/81126#authentication for more\n550 5.7.1 information. x9si120270qkf.220 - gsmtp
Diagnostic-Code: smtp; 550-5.7.1 This message does not have authentication information or fails to pass
550-5.7.1 authentication checks. To best protect our users from spam, the
550-5.7.1 message has been blocked. Please visit
550-5.7.1 https://support.google.com/mail/answer/81126#authentication for more
550 5.7.1 information. x9si120270qkf.220 - gsmtp
Received: from bosmailscan10.eigbox.net ([10.20.15.10])
by bosmailout05.eigbox.net with esmtp (Exim)
for email@example.com; Sat, 02 Feb 2019 10:27:24 -0500
I have temporarily changed the email in BC to send from Sales@mydomain but confident that does not correct the issue.
Although over the years I have not had any issue with Spam/Junk to my domain emails, lately I have which I had to filter in Roundcube.
BC offers a domain email address, should I be going in that direction?