Note if and what encryption was used for ssl/tls in the Received line
It would be helpful for debugging if the Received line added by mailgun would include the tls protocol if the mail was sent with starttls or ssl. I am currently using a node.js app with nodemailer and I think that uses starttls automatically, but I have no way to check that since it is not recorded in the mail.
The TLS connection type, certificate verification and mx host have been added to event logs.
You can also manage your TLS settings using our API. More on that https://documentation.mailgun.com/user_manual.html#tls-sending-connection-settings
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Arnold commented
It would be helpful if Mailgun provided the connection information in the details of each email.
Such as:
Connection: TLS
Connection: SSL
Connection: Plain TextI want to know if our end-customers are using TLS or SSL, so the whole e-mail path is encrypted or not and then I can work with them to fix it.
Currently, I can’t tell if a message is being sent over Plain Text vs SSL vs TLS.