Re: [mailop] Exchange 365 outbound connector being used as a relay

2022-01-29 Thread Matthew Richardson via mailop
Alexander Huynh via mailop wrote:- >On 2022-01-29 09:15:02 +, Matthew Richardson via mailop wrote: >> You may wish to have some authentication between O365 and Exim. The MS >> document linked discusses how to do this with certificates. > >The certificate setup listed at that page did not provi

Re: [mailop] Exchange 365 outbound connector being used as a relay

2022-01-29 Thread Alexander Huynh via mailop
On 2022-01-29 09:15:02 +, Matthew Richardson via mailop wrote: > As a thought (probably wrong) could this be caused by your O365 users > forwarding INCOMING email to them FROM outlook.com and/or mail.alokind.com > to external addresses? Since all mail flows through Exchange 365, O365 would hav

Re: [mailop] Exchange 365 outbound connector being used as a relay

2022-01-29 Thread Matthew Richardson via mailop
Alexander Huynh via mailop wrote:- >Meaning that domains `outlook.com` and `mail.alokind.com` have managed to use >Exchange >365 infrastructure to try and route email through my connector. As a thought (probably wrong) could this be caused by your O365 users forwarding INCOMING email to them FR

[mailop] Exchange 365 outbound connector being used as a relay

2022-01-28 Thread Alexander Huynh via mailop
Hello all, This info may be better reserved for a Microsoft support ticket, but I figure there are a few people here who could help short circuit the process, or offer insight into my issue. My mail service currently uses Exchange 365 as the data store, with an exim outbound connector [0] host