SocketTimeoutException when sending with K-9 Mail via smtp.gmail.com

Today I noticed an odd problem: K-9 Mail reported SocketTimeoutException when sending mails from an account configured to use smtp.gmail.com. When I set the server to smtp.googlemail.com without changing any of the credentials, it started working again. I didn't dig deeper, but I assume it might have something to do with certificates. It's still odd though because smtp.gmail.com and smtp.googlemail.com resolve to different addresses.

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