10.9.4 Mac Mail Problem

Me, too. I have four IMAP accounts, and much of the time a couple of them (but always different ones) display the little triangle with the exclamation mark in it. The problem comes and goes, and I can't figure out what is causing it or how to fix it.

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, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.

Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.

Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Ask for further instructions.

Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.

The login screen appears even if you usually login 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, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

I had the same issue since updating to 10.9.4 yesterday afternoon. I have two pop accounts.

Mail will not connect and error message received saying

"cannot connect to the server on port 110". Forget doing any diagnostic tests, the problem is caused by the update because all other devices (iPhone, iPad etc) receive mail OK. First I tried rebooting router and then several "restarts." Finally solved the issue this morning by simply doing a proper computer "shutdown" and then rebooting. All is now back to normal!

I am having the same issue.

Since upgrading to 10.9.4 I can receive mail, but I can not send any.

1. Check if other units are having same issue (no)

2. Check if account is live via webmail (yes)

3. Restart mail

4. Restart computer

5. Restart router

6. Verified settings with ISP and they are correct.

I have the same issue. I can neither send nor receive mail from my POP accounts. "The server “pop.mail.yahoo.com” cannot be contacted on port 995." and the same for the STMP. Any help would be appreciated.

For what it is worth, I downloaded Postbox 3 (the free trial version) and installed it after doing some research on what email programs play well with Mavericks.

Postbox 3 asked if I wanted to do a clean install or import settings from mail.

I did a clean install, then set up my primary pop email account using Postbox 3.

I am having no issues sending or receiving email using Postbox 3 and 10.9.4

Will continue to use free trial for 30 days before buying for $9.99 and will report back any issues.

Good luck everyone!

Postbox 3 seems to work about 50% of the time, same issue has returned.

I continue to experience this problem intermittently. I have gone a day or two without any problems, then a day like today it's non-stop errors and little warning triangles. In my case I have traced (part of) the problem to congestion on my network. I use CrashPlan, Arq and Dropbox to backup and sync, and Mail stalls when my Mac is uploading a lot of files. Other apps are not noticeably affected by activity on the network, so it appears that the current version of Mail is particularly sensitive to network interference. If I pause my uploads, Mail starts working properly.

Basic - but it worked! Thanks so much! Now I have to figure out how to use my printer..........