One of my 4 Gmail accounts has stopped being able to send mail

I have 4 gmail accounts. I can send and receive on all 4 but 1. This just started a couple of days ago. I get an error message that pops up but it goes away so fast I cannot see what it is. I have tried to screenshot it but I cant seem to get it. My mail locks up as soon as it happens and the mail I was attempting to send stays as a "draft".
I have searched the forums, and so far I have gone to google verified my settings to make sure somehting did not get messed up there.
I have checked my 1 account against the other 3 accounts and they are identical.
I have uninstalled and reinstalled that account i dont even know how many times at this point.
I was starting to try and uninstall the mail app but got hung up doing that so gave up on that plan (I also read that it probaly would not help what I have going on)
I logged into a different account on my iMac set up my mail on that account and having the same issue.
The only thing i have done in the past couple of days was link my gmail account to a computer at this college I attend (when u pull up google can synch) I did that but am unsure how that would mess up anything if at all.
Anyone else have any ideas?

Update I finally was able to get a photo of the error I am getting. its says
Unable to sign message
An error occurred while trying to sign this message wtha certificate from "[email protected]" Verify this certificate for this address is correct and that its private key is in your keychain.
So how do I do that?
I never took or messed with the keychain so I am unsure how to go about figuring that out.

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Hello Stephen,
If you are having issues with sending and receiving email, check out the first two articles to get it sorted out. Also look at the third link and look at the time at which you were having issues as it may be related to an outage of service.
iCloud: Troubleshooting iCloud Mail
http://support.apple.com/kb/TS4002
OS X Mail: Troubleshooting sending and receiving email messages
http://support.apple.com/kb/ts3276
Apple Services, Stores, and iCloud
https://www.apple.com/support/systemstatus/
Regards,
-Norm G.

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It closes the message as if to send it and then re-opens the window and freezes it. Whatsup?!?
I have tried deleting the mailbox and re-creating it, but it doesn't work. I am using SSL on this mailbox. No problem receiving mail, just sending.
Note: The email address works fine on my laptop -- the settings are identical (identical). ***?
--Alone & Confused in Western Mass.

Update I finally was able to get a photo of the error I am getting. its says
Unable to sign message
An error occurred while trying to sign this message wtha certificate from "[email protected]" Verify this certificate for this address is correct and that its private key is in your keychain.
So how do I do that?
I never took or messed with the keychain so I am unsure how to go about figuring that out.

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Hi - If I go into Mail preferences and click on Google accounts / account info - towards the bottom is "Outgoing Mail Server (SMTP) and that reads "Gmail (offline)". The dropdown menu gives me additional choices of "none" or SMTP Server list. The "Use only this server" tick box is ticked.
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Message was edited by: 12Suzy

RESOLVED - I don't know how to delete this post, but suffice it to say, I quit mail, opened it and suddenly gmail became an option from the dropdown menu.
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Hi Huygens-25,
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http://support.apple.com/kb/HT1430
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hjf71 wrote:
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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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well, everything appears to have resolved itself. Let me put this down in case it is of use to other iphone/gmail types.
1. apparently I must have had either a lot of different computers/devices accessing gmail at the same time and it locked me out. As sailman says above, what precisely is locked out is a mystery, but in my case it was my pc/outlook, my apple mail 4.1 and my iphone. Web access worked fine
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Hi,
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Have now also done the most recent upgrade to 10.10.2 but Mail still doesn't work properly.
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Hope this info helps in some way, do post if you find a solution/cause.
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Eric,
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