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I love to find out the history of the people and places and record the info. Is this really postal history??
Not really. "Postal" history, as the name implies, is the study of the stamps, covers, postmarks and other postal markings and possibly a stretch to even add in the stationery and/or envelopes used for the mailing. In other words, I would refer to "postal" history as that portion of the study that actually gets the piece of mail from one destination to the other.
On the other hand, genealogical research or even current history of the names in the return address or in the addressee of the cover are more or less historical facts about the people (or companies or organizations) that generated the mail.
As most will know, I love to do the historical research above and beyond just the "postal history" aspects of any cover. Often, one learns of a connection between two people (relatives?) or even two separate companies that complement each other in terms of a supplier that may offer equipment to a firm that manufactures the final product.
Then, of course, there is war correspondence, often dating back to the Civil War, but even more recent history of 20th century wars as well.
Obviously, the internet is a treasure trove of information about any variety of these sort of things. Of course, I try to limit myself by not getting into any personal information about a personality if it is thought that they may still be living. However, in terms of genealogical history, anything pre-World War I is quite often easily obtained and since virtually all of the personalities involved are deceased, there is little concern for invading anyone's privacy.
As it relates to more modern covers, I tend to focus on companies rather than individuals as I try to use some discretion about delving into personal details of a specific individual that may still be alive today, and certainly would use good judgment about posting anything of a personal nature (i.e. content of letters, etc.) on a forum such as this, since the information becomes an open book for virtually anyone wishing to gather what could be considered an unintentional invasion of privacy.