Apple Mail App giving me problems with the outbox

Have you updated the password for your outgoing mail server settings?

Doesn't explain the odd mailbox behaviour but might help with the pop up messages.

 

Problem after last MAC OSX update

I notice the same exact problem and it started happening right after the last OSX update. Did Apple mess something up with this?

 

Same here

I have exactly the same problem. Anybody found a solution?

 

I Have A Solution!!!

It seems that something got messed up with the mail account folders. when I went to the directory: Home:Libraries:Mail I saw folders for each mail box. but the names were strange and didn't match my account names. I opened the mailbox folders and opened the "inbox", and "sent" folders and copied all the email files to another folder to back them up. Then I deleted the entire mailbox folder for each mail account and emptied trash. Then I opened MAIL again and made sure that the old accounts were completely gone. Then with no accounts, MAIL went through its regular start-up cycle and i could create brand new mail accounts (entering in all new pop/smtp/etc info). once the accounts were up and working, i imported the mail files back into Mail...it put them in a separate folder and I needed to cut and paste them into the "inbox" and "sent" folders that I wanted, but no big deal. Then with all that, i also deleted the "Envelope Index" that is also in the Home:Libraries:Mail folder, so that the next time i opened Mail, it re-indexed (it said "importing") all the messages. after that it has ALL been back to normal. I'm sure there is a more elegant way to do what i said...but this seemed to work...essentially, back-up messages, delete the mailbox files and indexes and make brand new ones. good luck to you all. that was SO annoying!

 

same issue here on 10.5.4

yesterday i sent about 20 emails without problem.
this morning i can't send not even one.
i'm sure that my configuration ISP-side is correct because i personally made those smtp servers
and from VMware Fusion (Win XP's Outlook) using the same settings i can send the mails with no problem.

My solution was simple : REBOOT my iMac
After reboot everything was sent without a question and I sent other 30 emails with no problem at all.

I didn't have this issue from 10.5.1 till this 10.5.4.
Hope Apple will do something with that some day..

 

Solution that worked for me...

I had the same problem for weeks, and here's what worked for me:

1. Quit mail and go to username/Library/Preferences/
2. Move the com.apple.mail.plist file to the desktop and restart Mail
3. Mail is now in it's initial state but what happened for me is a message popped up saying (paraphrasing here) "A mailbox called Outbox has been detected - this is an name reserved by Mail. This mailbox will be renamed 'Delivered'..." Click OK to go to the next step
4. Once you've gotten past that prompt then I quit Mail, replaced the old com.apple.mail.plist file in the Preferences folder and restarted Mail

Once mail reopened everything was back the way it was, and it has been working fine ever since. No idea how that mailbox was created in the first place...