"Mail cannot access your mailbox information because it's already in use. Rebuild Mailbox information Quit" Both quits Mail.

After installing Yosemite, my Mail stops working after about 20-30 seconds when this Dialog Box pops up, freezes Mail and says:
"Mail cannot access your mailbox information because it’s already in use.
Another application on your computer or on your local network is using your mailbox information. Click Quit to quit Mail. Then log out of this computer and any other computer you’re using. After you log in again, open Mail on one computer only.
If this message reappears, there may be a network server problem. Contact your system administrator to determine if it can be resolved by rebuilding your mailbox information. Then click Rebuild Mailbox Information.
If this message reappears, there may be a network server problem. Contact your system administrator to determine if it can be resolved by rebuilding your mailbox information. Then click Rebuild Mailbox Information.
Rebuild Mailbox information Quit"
Clicking on either one quits Mail. I am receiving my emails. I can even send my self a test email and receive it before it freezes up in 20-30 seconds. My ISP thinks it's a "Kernal" software problem.
Through advice by a friend, I have tried:
Applications - Utililities - Disk Utilities - and selected my hard drive and then click Repair Permissions
Rebooted a bunch of times. The first time Repair Permissions printed a few pages of stuff. The 2nd, 3rd and 4th times, it printed out this:
Repairing permissions for “Macintosh HD”User differs on “private/var/db/displaypolicyd”; should be 0; user is 244.Group differs on “private/var/db/displaypolicyd”; should be 0; group is 244.Repaired “private/var/db/displaypolicyd”
Permissions repair complete
But I still have the same problem I stated the the beginning of this:(
Any more advice?

I have the exact same issue, just after installing Yosemite. Please advise

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Mail cannot access your mailbox information because it is in use

I have my mail on a Truecrypt drive and I have an alias pointing to that drive in my library and so sometimes I get this message:
"Mail cannot access your mailbox information because it is in use."
Options are:
"Quit and rebuild Information" or "Quit"
If I rebuild then I was losing all my sent messages which is a drag and it takes a while to re-download all the messages. So what I tried was deleting the Envelope Index.lock file and then launch mail and it started up with no problems.
I think the reason this is happening is that it is possible that when I shut my computer down, Truecrypt dismounts the drive while Mail is accessing the mail folder (hence the lock file) and so when I start up again and remount the truecrypt drive that lock file is still there and I have to delete it or Mail thinks some other program is using the mail folder. Just a guess.
Hope this helps someone else if they Google this error.

I do but I do it from another computer -- that is the whole point of IMAP, by the way. I don't see how my accessing the IMAP server from another computer should cause Mail.app to think that my mailboxes on my local host, which are just copies, need to be rebuilt. I filed a bug on this and Apple gave me the annoying "Known issue" response, which means maybe they'll fix it, maybe not, thank you very much. It went away for a while, and now it's back again... sigh.

Mail keeps crashing because: "Mailbox cannot access your mailbox information because it's already in use."

I have the new MacBook Pro with Retina Display, and my Apple Mail has always worked just fine. About a week ago, I recieve a message saying "Mail cannot access your mailbox information because it’s already in use." The dialogue box gave me the options of "Rebuilding Mailbox Information" or quitting the application. Rebuilding does absolutely nothing, and every time I try to open Mail I get the same response and have to quit. I haven't added any apps or anything that would affect my mail; what's going on? Thanks!

Try this first.
Isolating Issues
Isolating an issue by using another user account
Isolating issues in Mac OS X
Safe Mode
Safe Mode - About

On 10.4.11 Mac Mail I get this: Mail cannot update your mailboxes because your home directory is full. You must free up space in your home folder before using Mail. Delete unnedded documents or move documents to another volume. I can't open mail.

On 10.4.11 iMac Mac Mail I get this message: "Mail cannot update your mailboxes because your home directory is full. You must free up space in your home folder before using Mail. Delete unneeded documents or move documents to another volume." I can't open mail to do this. I have reinstalled software but no effect. How do I get into Mail to delete?

Found this on the "more like this" Worked like a charm!
With the Mail.app quit and using the Finder, go to Home > Library > Mail. Copy the Mail folder and place the copy on the Desktop for backup purposes.
Go to Home > Library > Mail > Envelope Index. Move the Envelope Index file to the Desktop.
Launch Mail and you will be prompted to import mailboxes. Select OK and allow the import process to complete.
After confirming all mailboxes were successfully imported and available, you can delete the copy of the Mail folder and old Envelope Index file from the Desktop and this should resolve the problem.

"Mail cannot update your mailboxes because your home directory is full"

I have a 250 GB hard disk, 4.34 GB of which is in my "Home" folder. (Total HD usage is about 27 GB.) This happened suddenly after Mail had been working fine for eons. I deleted a bunch of files (107 MB) in a "Drafts" folder (none show up in the Mail app's "Drafts" icon), but it made no difference. I re-installed the Mac OS X 10.4.11 combo update... no difference. Mail version is 2.1.3.
Any help here? I cannot use Mail at all.
Message was edited by: Bill Strohm

Hey there,
Have you had a chance to look at this Apple support document relating directly to this issue. Hope it helps.
[Mac OS X 10.4: "Mail cannot update your mailboxes because your home directory is full" alert|http://support.apple.com/kb/TA24486?viewlocale=en_US]
B-rock

MAIL cannot update your mailboxes---error in MAIL 2.1

"MAIL cannot update your mailboxes---"
Have 26 Gb of space left and found the fix to delete the Envelope Index file. I moved Envelope Index to the DT and relaunched MAIL. It seemed to import 1200 items, then it just goes to colored wheel of death. Had to Force Quit 3x.
Any ideas? Im trying to help a senior fix this problem. She cant get her email.

Hi Steve,
Not certain, but this can fix myriad Mail problems...
Safe Boot from the HD, (holding Shift key down at bootup), it will try to repair your Disk Directory while the spinning radian is happening, so let it go, run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, then move these folder & file to the Desktop.
Move this Folder to the Desktop...
/Users/YourUserName/Library/Caches/Mail/
Move this file to the Desktop...
/Users/YourUserName/Library/Mail/Envelope Index
Reboot.

Just upgraded to Yosemite 10.10.2 on my iMac 24 inch and now my Suddenlink POP email account won't accept messages. The message says unable to receive Mail and the warning says: Mail cannot send your password securely to the server. You can remove th

Yesterday I uploaded Yosemite 10.10.2 thinking it was fixed by now. In Mail, my POP account gets this error message: Mail cannot send your password securely to the server. You can remove this restriction in the Accounts preferences by setting “Allow insecure authentication”, which could put your password at risk.
My provider says it's an Apple issue. The gmail accounts are logging in fine. Any help? Something simple?
Thanks anyone.

Thanks Csound1. That did work and Mail was able to connect to the internet. Green light status. Is it because of my provider that I may never have had secure connections? Is that an Apple thing or do PCs have the same issues? Appreciate your help. I'll research insecure connections as I am ignorant of the consequences.

I cannot access my old email address anymore, however I have used it for my apple ID and now I want to delete it because the account has never been verified in the first place so my password for it doesn't work. What do I do?

I cannot access my old email address anymore, however I have used it for my apple ID and now I want to delete it because the account has never been verified in the first place so my password for it doesn't work. So when I want to download apps I have to sign in with apple id but I can't so I made a new one, However I can't seem to be able to delete the old one. What do I do?

You can't merge Apple IDs. You also can't cancel (delete) and existing ID, you can only choose to stop using it.
If your old ID was compromised and you can no longer access it, you'll have to contact Apple for assistance. Go to https://expresslane.apple.com ; click 'See all products and services' at the bottom of the page. In the next page click 'More Products and Services, then 'Apple ID'. In the next page select 'Other Apple ID Topics' then then 'Apple ID account Security’.

Mail cannot access the mail server, but other email clients do.

My web host recently had extended problems with the mail server my sites are on. Now, Mail on my iMac Intel 27 Duo says it cannot access the server. However, Thunderbird and Entourage Mac have no problem. Sending from Mac Mail seems to be Ok as well. I've checked the settings over and over. I received no system disk for this machine when I bought it. Do I need to reinstall Mail, and if so, how?
The info below from Connection Doctor shows it appears to be trying to access through Port 25 but I have Mail set for 587 as instructed by the hosting company. I have renamed private info in the text below.
READ Jan 16 09:56:42.941 [kCFStreamSocketSecurityLevelNone] -- host:mail.myemail.com -- port:25 -- socket:0x11f51aed0 -- thread:0x122c48a20
250-servername-a41.g.webhostname.com
250-PIPELINING
250-SIZE 40960000
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250 8BITMIME

However, Thunderbird and Entourage Mac have no problem. Sending from Mac Mail seems to be Ok as well. I've checked the settings over and over.
Well if TB and Entourage can both send and receive but Mail can only send I can only conclude you missed something in you rechecking. Of course with you being the only one checking you are going to make the same "mistake" and never no it. So post the relevant POP server info for your ISP (edit out personal info and passwords of course):
Account Info:
Incoming Mail server: pop server address
User Name:             required user name POP server is looking for (censor)
Password:              password required by POP server (censor)
Advanced:
Port:      995, 25, default?
Use SSL:   yes or no
Auth:      kind of authentication

HT2458 Has anyone else who uses AT&T as their carrier been told if you cannot access your voicemail through your iPhone that there is no way to check your voicemails? This is an issue since I had to send my phone in for repair. Thank you

Has anyone else who uses AT&T as their carrier been told if you cannot access your voicemail through your iPhone that there is no way to check your voicemails? This is an issue since I had to send my phone in for repair. Thank you

You received incorrect information from AT&T. You can indeed access your voicemail without your iPhone.
Call AT&T at (800) 331-0500 (assuming you're in the U.S.). This is a 24 hour a day, 7 day a week number. Ask them how to access your voicemail. Normally, you would just do this by dialing your number from another phone, typing "*" once your voicemail recording starts, and entering your password. You don't know your password, so it's probably the last four digits of your phone number or perhaps the seven - or ten-digit phone number. Let the AT&T person tell you.

Loaded Yosemite onto mid 2011 MacBook Air. IMAP account goes offline - message - Mail cannot send your password securely to the server. Allow insecure authentication doesn't work. Repeated reloads. No joy. Help!

Mail cannot send your password securely to the server. You can remove this restriction in the Accounts preferences by setting “Allow insecure authentication”, which could put your password at risk.

I have the same problem.
Late 2012 imac 27", intel i7 core
When I upgraded to Yosemite, suddenly my email account (netvigator POP) gives an error:
Mail cannot send your password securely to the server. You can remove this restriction in the Accounts preferences by setting “Allow insecure authentication”, which could put your password at risk.
I have shut down & restarted mail, but no success. If I select Allow insecure authentication, it works, but that's not a long term fix.
I also have a hotmail POP account enabled, and that is working fine.
What's happening Apple??
(Long term apple family - iMac, iBooks, TimeCapsule, iPhones, iPads, AirportExpress etc etc)

HT204053 I cannot access the app store because it wants to access an @me Apple ID that no longer works. How do I eliminate this ID so I can access apps?aid

I cannot access the app store because the iPad is requesting a password to an Apple ID that does not exist. The app store seems to be using an @me iCloud address as the Apple ID. This is not my ID or email addresses. How can this be changed to my Apple ID?

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http://support.apple.com/kb/HT1311

IMovie Cannot Access your Photos or videos - To enable access..blah blah..doesnt work

The error I am receiving is ...
iMovie cannot access your photos or videos
To enable access open the Settings app, tap location services and set the imovie switch to ON
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What am I doing wrong?
I am using an IPad with OS 6.01

OH AND it started happening when I went to IOS 6.01
IT was working fine before that time.

TS3276 Apple Mail cannot find replies or forwarded emails -- the little arrows on the left of the list of emails: "Mail was unable to find your reply to the message '[subject of message]'. You may have deleted the message." I did not delete the message.

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Of course they're in my Sent folder. Then why can't Apple Mail find them?

"Cannot access your router"...but router is on! Huh?

I just want to change my guest password on LinksysE1000. So I run Cisco Connect and get "Cannot access your router." How can that be when it works fine otherwise? Any help appreciated.

So,If your Cisco Connect Software is not responding then,it this case you have to un-install the software completely from the computer then,download and install the Cisco Connect Software from linksys website and you have re-configure the entire network again.

"Mail cannot access your mailbox information because it's already in use. Rebuild Mailbox information Quit" Both quits Mail.

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