Some people write emails as a way to get across vital work- or life-related information, as a means to an end.
Some people write blogs to further political, social, or personal causes.
For me, all of this writing and talking and sending out of information serves a different sort of a purpose. It's me calling out, saying "I am here! This is the state of things; this is my life. It may be pathetic, or lonely, or wonderful. I may inflate myself with egotism. I may sell myself short. But this is who/where/what I am and I am something that is and I breathe and live. I just wanted you to know that."
That last line is important. I just wanted you to know that. Who is "you" ? Who are you? Sometimes it's the person I am emailing. Generally an email to a particular personal acquaintance will be worded differently than one to another. However, the real, underlying message is still the same.
I am here. I want to be known. I don't want to be alone, or forgotten. I want to know that I am something and not nothing. Someone, and not nobody. To "you" or to the world. It matters little.
It's not really what I was looking for; that would require actual response and interaction with another living being. But it is a livable substitute. I may never have my existence acknowledged by any social institution or the world society; but hopefully, on those occasions when I really need it, my occasional email will go answered by someone who knows, or maybe even appreciates, that I am alive.