Forum Discussion

Ginny Soyars's avatar
Ginny Soyars
Copper Contributor
Feb 25, 2021
Solved

Inbound OnPremises connector seeing significant mail flow without TLS warning

We have Office 365 email licenses and we use MS Office/Outlook 2019 on Microsoft Windows Servers v2019.  We do NOT have an OnPrem email server.   We used to use smtp.office365.com as an smtp server...
admin
office 365
  • SeanMcAvinue's avatar
    SeanMcAvinue
    Apr 09, 2021
    If the ERP app doesnt support TLS1.2 then no matter where you send it won't be capable of TLS1.2. The connector would pick up the traffic as it's coming from your on-premises public IP, regardless of if you use smtp.office365.com or the MX record.

    Set up an IIS relay on prem, use that as your relay and send from there securely to Exchange Online
LorneC555's avatar
LorneC555
Copper Contributor
Apr 09, 2021

Ginny Soyars 

 

Hi Ginny 🙂

 

Any luck with this?

 

I have same problem - hard to know how concerned I should be - in my case - 3rd party ERP vendor - typically says yeah it's fine! 

  • Ginny Soyars's avatar
    Ginny Soyars
    Copper Contributor
    Apr 09, 2021

    LorneC555 No, I haven't made any progress on this. An MS rep private-messaged me for more information, which I provided, but he eventually said he couldn't help and I should open a formal support case with Microsoft, but I don't know how to go about doing that - plus I don't feel confident I would really get anywhere with Microsoft anyway.  So...