Q: Mail not working after update OS X 10.10.4 and IOS 8.4

i had multiple email accounts (pop, IMAP and Exchange) synchronised across three Macs, with several of the accounts also on two IOS devices.  When I had upgraded two of the Macs but not the third, Mail on one of the upgraded ones was completely refusing to run (spinning beach ball), whilst the other appeared fine.  When I upgraded the third machine, the one that hadn't been working suddenly decide it was fine and now all three machines are ok.

I suspect this is a separate issue to the SMTP problems being reported, but for those with accounts on more than one Mac, upgrading them all might resolve the issue - but it is obviously a risky strategy.  It worked for me, but impossible to know whether it would work in other circumstances.

Not so much a solution as an observation.

It looks like SSL was messed up by the update. Try turning off SSL and rebooting.

Many thanks - I'll give that a bash right now and see, Nothing else seems to work. Big, BIG problem with this update. I've reported it, as have others - one can but hope. I'm certainly not updating the MBP or moving other things IOS 8.4!

No difference. This *****. Hey ho!

Just turning off SSL didn't work for me either, I had to take more drastic steps to get mine working. Detailed in posts above.

HHaving the exact same problem!  Afraid to delete old accounts as I don't want to lose the many emails I've kept. We need a fix on this!

I have the same problem My emails don't leave the outbox. I upgraded yesterday to the Yosemite 10.10.4

Does anyone know how to fix it??

After a session of nearly two hours with Apple Support - resetting PRAM, booting in safe mode, changing ports to every number imaginable. No difference. I've to call again today.

Hey ho!

At least one of the advisors said they too had issues with 10.10.4

upgraded to 10.10.4 now suffering slow mac mail

Mac book is slow to close down because of mac mail

when selecting mail/preferences/General/accounts  get spinning wheel for several seconds before response !

Mac mail can take up to 30secs  to quit.

I too had multiple accounts. Reading another post in this thread, I shut off the gmail account and now it works fine. Fortunately, I never use that account.

Bob

Also, I'd suggest telling each device to forget the WiFi connection - then re-establish it. There were WiFi issues that may be affecting those with SMTP issues.

Bob

Forgetting network did nothing, I'm afraid.

I've tried Postbox too - no use, same problem.

Apple? Hello? 10.10.5 coming soon?

Mine stopped working, this is appalling to roll out an OS with such a basic fault that cannot maintain settings for email. Apple what are you doing, this has to be fixed. People can't run businesses without email, get a fix out VERY URGENTLY.

I don't know why this worked but I deleted my email account and set it up again from scratch.  Everything seems to be working now.

I have the "mail not responding" problem about half the time on my 2010 MBP after upgrade to 10.10.4 but the other half it works fine.  I can't tell why sometimes it loads and sometimes it doesn't.  The IOS devices work fine.