And whether or not the email will be encrypted from your provider's SMTP server to the recipient's inbound server depends on whether or not the recipient's server is set to use TLS for inbound mail. This does not, however, affect the security/encryption of the email before it is sent nor after it is received. From there, the transmission of your email to and from the SMTP server will be encrypted. In short, the way TLS works is it will establish a connection between the client and the SMTP server by way of a certificate, which authenticates you to the SMTP server. Most do these days, since TLS is essentially a successor to SSL. The thing to be aware of is that TLS only works if it is being used on the email provider's SMTP server(s). Information about how to set this up depends on your email provider, so they should have instructions available for you on exactly what to put in there. This can be done by opening Mail > Preferences > choose your email account > Advanced IMAP settings button (in there, you can choose a TLS certificate to use).
As long as your email provider uses TLS for their SMTP servers, you will be able to enable it within the Mail app.
If encryption's involved, then wouldn't every single e-mail recipient have to also implement TLS? Or does encryption/decryption only take place in in-transit servers? Some time ago, I thought that TLS allowed an account's password and body text to be encrypted, preventing any sort of effective eavesdropping en route, but I'm beginning to wonder if that's correct. However, I'm comparatively ignorant of the workings of TLS, so can someone enlighten me as to how TLS works? Are there different levels of TLS that can be used maybe just certification from the source of the message, or instead some form of full encryption/decryption? My e-mail provider, along with most others, now highly recommends that I use TLS. Is this the case and, if so, how should the settings be used and, generally, what needs to be done to fully implement TLS in an account configured into Mail? But when I move to Sierra, I gather that Mail, and hence the e-mail account, can be secured by means of some proper TLS settings.
I'm given to understand, though, that Sierra does now provide TLS in its place.Ĭertainly, as matters stand at present, my e-mail traverses the Internet non-secured (in plaintext). Unfortunately, SSL for e-mail is, for the mostpart, redundant these days. In Mavericks, it appears that the only security settings remotely of this type made available for POP/IMAP accounts are SSL. OSX Mavericks (from which I'll be migrating shortly to Sierra) doesn't support TLS (Transport Level Security).
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