I really just only registered here to inform everyone that I had the same problem (different provider - this came up on google as I was searching for the solution). After hours of trying to find the problem on my IMAP/SMTP server I realized that Spark is a piece of ** app and has a messed up DNS resolver. Our server's DNS name did not work when you input it in the app, but if you put it's IP address everything works without issues. Spark eat ** honestly. I do apologize for my bad language, but I was upset for all the wrong reasons. Also OP is an **.
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