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![]() ![]() Interestingly when sending from webmail (not business), the first header entry is MAPI and then shows two TLS connections before using ESMTP/SMTP (see below). ![]() In this case, the middle "received" portion is that which is confusing. ![]() They are in order of transport as they appear, so top is the most recent where bottom is original. These are received headers - email is send with O365 SMTP. I don't understand why.Ĭan anyone offer any insight? Thank you in advance. Even if I send "internally" via Exchange Online/0365, it still shows MAPI after first TLS 1_2 connection. I'm curious why the MAPI option is showing up. I am not sending the mail via a software MAPI client (Outlook). The second shows MAPI, and the third again shows TLS 1_2. The first connection appears to be secured with TLS 1_2. Depending on where I send the email, it goes 3-5 hops to different servers. I'm reviewing email headers to determine if an email sent via SMTP is using TLS 1.2. ![]()
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