Just wonderful. I periodically check my spam folder and find a plethora of messages sent (allegedly) from my primary email address. Gmail now says that it’s a known spammer address. I’ve had this address over a decade.
Fuckers.
Are you sure? Almost everyone has a lot of spam sent from themselves (according to the headers) - it seems to be something that spammers do.
Change your password. Change it to something complex. Couldn’t hurt.
They’re not actually using my account, but joe-jobbing me. They’ve picked up my email address from somewhere.
I have a Yahoo! email account whose spam folder is filled with dozens of emails that appear to be from me, sent to myself and three other Yahoo! accounts with somewhat similar usernames (starting with the same four letters, anyway). There are also similar emails to me “from” those users. Online pharmacies, peni$ 3nl4rgement, the usual stuff.
We’re all spamming each other now. We are all one.
And yet Gmail says your address is a known spammer address? That seems odd.
Not really. They’ve obviously received a lot of email addressed as me.
Where does it show you that your address is a known spammer email?
How does an email that isn’t actually sent by you wind up in your Spam folder? Are the spammers cc’ing you or something?
The Reply-To address is set by the original sender. I could send people an email that, at first glance, appears to be totally authentically sent by “Barack H. Obama <president@whitehouse.gov>”.
<paddles through Gmail settings>Well, how about that. There it is.
<checks spam folder>
Nope. No angry replies. Guess I’m clear so far.
If you open one of the spam emails, GMail will tell you why it’s been blocked. In this case it says,
That’s probably just an automated function that identifies e-mail with identical from and to addresses as probable spam.
I reckon the spammer’s a reader of the Dope. Because it’s stopped completely. 
That is something that gmail should do away with.
I get e-mails from spoofers.
If I know, for example, JohnDoe@Gmail.com, I might receive an e-mail from JohnDoe@someunknowndomain.com. If I see John Doe and open it accidentally, and click on the link (inevitably there is one) my firewall goes nuts.
I actually did that on the first spoof I received and learned my lesson. Pity the folks without firewalls. Now I always check the full e-mail address. If it’s a spoof, I put it in the spam/junk mail folder without opening it. Had two yesterday and one today.
If someone is actually using your e-mail account, contact your provider and be sure to change the password, if you are still able to do so.