your big problem with emails is that deleting an IMAP email doesn’t really delete it, but instead moves it into the trash can, which must be emptied before the email is deleted, and even then the email isn’t really deleted locally until you compress the folder ... and even then many email services keep multiple backups of your emails on their servers ... it’s really just best to never put anything in an email unless you’re willing to have the whole world read it ... that was the rule of thumb we all learned back when email was available only in the academic and military world before the civilian Internet was started ...
I'd like to revise that statement. When I separated out of the USAF as a Telecommunications Systems Controller early in 1981 we did not have email. After a year and a half at ITT and then a year and a half at Sprint, I hired on with MCI on December 14, 1983. We were already using our email to communicate around the world at that time.
MCI Mail service was launched on September 23, 1983, in Washington, D.C.I was the Senior Maintenance Tech in Atlanta with the MCI Mail facility the next floor down from our Terminal. When the NSF project came along I was working at Our Regional Hub at Austell, GA when those NSF backbone routers were installed. I retired after 31 years with Verizon Business(legacy MCI).On January 1, 1983 the ARPANET converted to TCP/IP as its standard host protocol. Gateways (or routers) were used to pass packets to and from host computers on local area networks.
In September 1984 work was completed on restructuring the ARPANET giving U.S. military sites their own Military Network (MILNET) for unclassified defense department communications.[48][49] Controlled gateways connected the two networks. The combination was called the Defense Data Network (DDN).[50] Separating the civil and military networks reduced the 113-node ARPANET by 68 nodes. The MILNET later became the NIPRNet.
In the mid 1980s, National Science Foundation Network (NSFNET) decided to build a network called NSFNET to provide better computer connections for the science and education communities. The NSFNET made possible the involvement of a large segment of the education and research community in the use of high speed networks. A consortium consisting of MERIT (a University of Michigan non-profit network services organization), IBM and MCI Communications won a 1987 competition for the contract to handle the network's construction. Within two years, the newly expanded NSFNET had become the primary backbone component of the Internet, augmenting the ARPANET until it was decommissioned in 1990.