Reference/Documentation about eMail

This is the beginning of a collection of mail references, tips & tricks and general information about Internet eMail. Considering how important eMail is on the Internet, there is not much information to be found about the details of its functioning. I hope to add to this information over time, although I don't promise anything. Comments and additions are always welcome.

Anatomy of an eMail address Characters allowed in the local part of a mail address The POP3 LAST command and why it is obsolete