one partner, is complaining that he's not receiving our emails

[MohamedLotfiBOUCHERIT54563]

Hello,

We have a partner, that we send important emails, in a daily basis. Three or four days, he complains not receiving our emails, while in IronPort message tracking, we see that there no issue, with our emails, and all emails get queued for delivery.

I attach to this post couple of emails, and would like to get help resolving this issue.

Thank you in advance,

[Libin Varghese]

The emails show processed without any issues and handed off to MTA 104.47.1.36 for delivery as per the DCID information.

This will need to be investigated further from that MTA as to what was done with the email down the line.

Regards,

Libin

[MohamedLotfiBOUCHERIT54563]

Thank you for your answer,

This would mean that the recipient MTA might have blocked the emails somewhere, right?

Thank you in advance

[svgeorgi]

In both cases you got a response of success from the remote server hosted in O365:

'2.6.0 <71df8cb29b4443bbb48cd58f8c7759e0@sender.com> [InternalId=19134079305829, Hostname=VI1PR02MB4272.eurprd02.prod.outlook.com] 590414 bytes in 0.389, 1481.166 KB/sec Queued mail for delivery'.

That means that remote server VI1PR02MB4272.eurprd02.prod.outlook.com (104.47.2.36) accepted the letter, assigned an internal ID for it "19134079305829" and has processed it. If the remote party would like to understand what really wrong happened with the message in O365, they will have to investigate what was the destiny of this message with this ID in that server.

Your ESA successfully delivered both messages to their MX records.