@ed1conf @UkiahSmith The mail client talks to the MS cloud and the MS cloud talks with the mail servers. Tbh I only looked at contacted IPs and didn’t dive deeper because I just wanted to see why it didn’t work for my colleague. So I looked at the dump and searched for the IPs I expect them to connect which they didn’t and looked at my mail server logs and only saw an MS cloud-IP. (1/4)
I guess the mail client just talks with MS, submits the data and actually the “MUA” sits in the MS cloud and does all the rest. It is not like with a browser where you see an URL you connect to and can check the cert. You enter your mail server and your credentials and then you have a representation of your mailbox with your mails. (2/4)