mail between servers is also generally encrypted via TLS
Source for this? It historically has not been, but this may have changed.
Regardless, end-to-end encryption with PGP or S/MIME is the only way to really send "secure" email, and even then you're vulnerable to snooping/mishandling/exposure at the end points when the emails are actually read.
I run my own private mail server and also manage one for a company I consult to and anecdotally I can back this up. The logs for both servers show that the bulk of MTA to MTA traffic is encrypted.
How fortunate for us that you found the time to offer this insightful rebuttal.
I stand corrected. There are not a zillion entires in that database. There are many hundreds, covering only approximately 2B email accounts. Clearly the question of wether these data are representative of email security at large must be resolved in an properly peer-reviewed academic journal.
I am sorry to have wasted your valuable time with such an ill-considered comment. Please accept my heartfelt apologies.
Source for this? It historically has not been, but this may have changed.
Regardless, end-to-end encryption with PGP or S/MIME is the only way to really send "secure" email, and even then you're vulnerable to snooping/mishandling/exposure at the end points when the emails are actually read.