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I'm experiencing an issue sending out email using Mail.app on my MacBook Air (13-inch, Mid 2013) running OS X Yosemite 10.10.2 (14C94b).

... shortly after hitting "Send message" button, I'm receiving following error:

The operation couldn’t be completed. (MCMailErrorDomain error 1045.) 

I have NO problem sending out email from my iPhone 6, using same settings and from same network and I am able to connect to remote smtp server via Terminal.app as well.

I rechecked my username, password and the rest of the settings MULTIPLE times and not really sure what else to do...

Any ideas?

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I had the same problem in Mail / OS X 10.10.2.

After long searches for an answer, I solved the problem simply inserting again my passoword for the SMTP account.

Even though the stored password was correct, it didn't work until I inserted again the password. Go figure why it didn't work before !!

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  • And by the way, can anyone explain me what exactly "MCMailErrorDomain error 1045" mean? Thanks. :-) Feb 18 '15 at 14:43
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Updating to El Capitan, I had this same problem. When I checked my mail settings I noticed that my incoming port was changed to 143 from 993. I changed it back to 993 and turned on SSL and all worked again.

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