I have 2 software that sends email via an office365 account over SMTP.
1. Materials Control by Oracle - this one sends an email notification to the approver telling them that they have something in the system to approve whenever there is something to order.
2. Arcserve back up report - sends an email reporting failure or success in its back up tasks everyday.
Recently, both of these keep getting inconsistent sending of emails. Some goes through and some don't.
For me, system is zeroes and ones. If it works, it works. If not, it shouldn't. But inconsistence like this blew my mind. I tried telneting to smtp.office365.com a few times and it connects to different servers all the time. Sample below.
220 SI2PR01CA0046.outlook.office365.com Microsoft ESMTP MAIL Service ready at Thu, 28 Oct 2021 07:28:54 +0000
220 SI2PR02CA0012.outlook.office365.com Microsoft ESMTP MAIL Service ready at Thu, 28 Oct 2021 07:29:40 +0000
When I'm able to telnet to server 0016, then emails will go through. Is this weird? Could someone shine a light on this?