<recipient email> Remote Server returned '550 5.7.708 Service unavailable. Access denied, traffic not accepted from this IP. For more information please go to http://go.microsoft.com/fwlink/?LinkId=526653 AS(8561) [HK0PR01MB2690.apcprd01.prod.exchangelabs.com]'
Original message headers:
Received: from HK0PR01MB2196.apcprd01.prod.exchangelabs.com
([fe80::a874:cd68:fb56:1f38]) by HK0PR01MB2196.apcprd01.prod.exchangelabs.com
([fe80::a874:cd68:fb56:1f38%4]) with mapi id 15.20.1250.032; Thu, 25 Oct 2018
Date: Thu, 25 Oct 2018 02:54:42 +0000
Subject: User shared "<document name>" with you.
I've tried sending to different email providers and domain, and from reading some past posts, it seemed like the issue is pertaining to Office 365 / Exchange rather than on the recipient end.
Sending email via outlook works perfectly fine, but only undelivered when shared through SharePoint.
Appreciate any assistance on this issue urgently. Thank you !