Possible Mac Mail Security Issue

A couple of times each week, I'm receiving returned e-mail messages that describe mail that I did not actually send. The "undeliverable" addresses in the Mailer-Daemon notifications are unfamiliar and involve a different overseas address for each notification.
Every aspect of the computer runs fine. in four years of being a devout Mac convert, I have not seen this type of problem until the past few weeks. So from my standpoint, the false notifications are just a minor annoyance. I've been deleting them. But, I wonder if there could there be a security issue or some other problem?
Thanks very much,
Charley

I am experiencing the same thing and it has just started in the last few weeks also. I get the mailer-daemon messages telling me I have had my emails rejected to people that I don't even know nor do I have anything to do with the message being rejected.
I am concerned that my computer has somehow been compromised but do not know whether or not this is the case.
The issue is how do we try to stop this - I read elsewhere that the email password needs to be changed but I am not sure if this is actually going to do anything at all.
Anyone have a suggestion to stop this?
Thanks

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I use Mac Mail with Gmail. I have a bunch of mailboxes set up within Mac Mail to organize my email. They appear under the "On My Mac" section on the left side of the Mac Mail screen. I assume this means that all of my email content is stored on my Mac. Once in a while I access Gmail via the web, but it's only to send a short note. I have no folders (i.e., labels) with email content in the Gmail web environment.
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Thanks

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The issue is how do we try to stop this - I read elsewhere that the email password needs to be changed but I am not sure if this is actually going to do anything at all.
Anyone have a suggestion to stop this?
Thanks

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Apple doesn’t routinely monitor the discussions. These are mostly user to user discussions.
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carlger wrote:
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Cheers

If it is in the wrong format it must probably still show up though, if your mac does detect it, go to disk utilities> choose the device from the left hand side > go to the "erase" tab and change format to "Mac OS extended (Journaled) then hit "erase".
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Go to Applications/Utilities/Keychain Access and delete your e-mail account password.
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HI,
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Hi,
Please follow Luke and Shelly’s suggestion to check your SPF record and Send Connector configuration. Also you can post the complete NDR message(with NDR status code) here for further analysis.
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Hi,
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Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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Greetings!
I recently an iPhone. I previously was using a Pearl with RIM's BIS setup to access my email (verizon/yahoo POP3 acct). Since I moved to the iPhone, I've noticed whenever it accesses my email account, the Mac Mail displays the pop-up window requesting the password saying the email server had rejected it. About a minute or so after the iPhone is done with the email account, I'm able to enter the password and Mac Mail can access the account.
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Hi 2point5,
THX for help, but that didn't help me. Maybe I didn't describe my Point exactly.
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