https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol the ubiquitous name used for all email sending settings

https://en.wikipedia.org/wiki/Spam Spamming, unsolicited or undesired electronic messages – so that includes on or in the likes of S.M.S. and Whatsapp and Facebook etc

https://www.spamhaus.org/ threat intelligence provider

https://en.wikipedia.org/wiki/Email_spoofing sending you an email from an email address that did not send that email; this is where defences like SPF and DKIM come in to play, not least to prevent your own email address being used by crooks.

https://en.wikipedia.org/wiki/Tape_drive Both ancient and modern data storage capable of holding large volumes of data, slow and only serial access, but very effective in its proper place. The hardware tends to be expensive so used mainly by large businesses.