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Email logs to search for if message is not delivered using Office 365 email

633 52 February 4, 2018 at 08:40 PM Get Office.com Coupons
We have a Office365 mailbox and are using SMTP client submission (Option 1 of https://support.office.com/en-us/...05d654b4c4
to send emails from a device(computer on our network) which has a static IP address.

However, the emails are not received by our users who also have Office 365 email accounts. The login credentials of Office 365 are correct and our network admin has confirmed that traffic from the device is reaching the email server. But, the system admin does not have any record of emails received by the email server. He has white-listed the IP address of the device sending the email as well as the Office 365 email account used by the device.We are using Barracuda Spam firewall and it is expected to allow emails after white-listing the IP address of the device and Office 365 email account used by the device.

The main system admin is on leave, his backup does not have time to help us so has assigned an intern to help us. The intern is helpful, but is new and needs to be told which log files to typically look for if the message is not delivered.

The error messages I am receiving are like

"SMTPC" 860 10 "2018-01-30 16:28:40.920" "X.X.X.X" "SENT: AUTH LOGIN"
"SMTPC" 4508 10 "2018-01-30 16:28:40.950" "X.X.X.X" "RECEIVED: 334 VDNlbm6hcWU7"
"SMTPC" 4508 10 "2018-01-30 16:28:40.950" "X.X.X.X" "SENT: c2llbWVucw=="
"SMTPC" 860 10 "2018-01-30 16:28:40.980" "X.X.X.X" "RECEIVED: 334 UFFzc3dvcnQ2"
"SMTPC" 860 10 "2018-01-30 16:28:40.980" "X.X.X.X" "SENT: ***"
"SMTPC" 4508 10 "2018-01-30 16:28:46.029" "X.X.X.X" "RECEIVED: 535 5.7.3 Authentication unsuccessful [xxxxxx.prod12.prod.outlook.com]"

The login credentials of Office 365 are correct and I have confirmed it. I tried ports 587 and 25 with TLS enabled.

1. What log files should one start looking when network traffic reaches the email server, but emails are not received by the users?

2. What other steps can be taken to identify the issue?

Any suggestions would be appreciated.

2 Comments

1

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Joined Aug 2005
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#2
I would suggest opening a case with Office365. My guess is you have some antispam/antispoofing thats playing a factor here.
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Vague questions receive vague answers . . . . . .
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Joined Apr 2010
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Original Poster
#3
Quote from LiquidRetro
:
I would suggest opening a case with Office365. My guess is you have some antispam/antispoofing thats playing a factor here.
Thanks, I told that to the system admin intern.
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