Exchange hybrid - wrong mail routing to external

%3CLINGO-SUB%20id%3D%22lingo-sub-2077780%22%20slang%3D%22en-US%22%3EExchange%20hybrid%20-%20wrong%20mail%20routing%20to%20external%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2077780%22%20slang%3D%22en-US%22%3E%3CP%3EHi%2C%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EI%20have%20an%20new%20hybrid%20connection%20between%20Exchange%202019%20and%20O365.%20Mailrouting%20inbound%20and%20outbound%20(CMT)%20through%20onpremise%20Mailrelay.%3C%2FP%3E%3CP%3EOnly%20one%20testuser%20are%20already%20migrated%20to%20O365.%3C%2FP%3E%3CP%3EAfter%20some%20testing%20I%20found%20in%20O365-Messagetrace%20many%20Mails%20to%20external%20recipients.%20These%20mails%20are%20coming%20from%20the%20puplic-IP%20from%20the%20Mailrelay%20and%20where%20sent%20to%20recipients%20they%20are%20also%20in%20O365%20(recipient-mx%20pointed%20to%20O365).%20Other%20recipients%20(google%2C%20gmx.....)%20where%20sent%20directly.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EAll%20mails%20should%20be%20sent%20from%20mailrelay%20to%20external%20and%20not%20through%20own%20O365-Tenant.%20The%20O365-Messagetrace%20should%20only%20be%20shown%20internal%20Mails%20for%20my%20understanding...%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EI%20hope%20this%20is%20understandable%20%3A)%3C%2Fimg%3E%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3Ekind%20regards%2C%3C%2FP%3E%3CP%3EMarkus%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-2077780%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3EExchange%20Online%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3EExchange%20Server%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3Ehybrid%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E
Occasional Contributor

Hi,

 

I have an new hybrid connection between Exchange 2019 and O365. Mailrouting inbound and outbound (CMT) through onpremise Mailrelay.

Only one testuser are already migrated to O365.

After some testing I found in O365-Messagetrace many Mails to external recipients. These mails are coming from the puplic-IP from the Mailrelay and where sent to recipients they are also in O365 (recipient-mx pointed to O365). Other recipients (google, gmx.....) where sent directly.

 

All mails should be sent from mailrelay to external and not through own O365-Tenant. The O365-Messagetrace should only be shown internal Mails for my understanding...

 

I hope this is understandable :)

 

kind regards,

Markus

0 Replies