I don't know about the rest, but surely the race conditions are the fault of whoever designed the concurrency part. An email client does not inherently have race conditions.

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asdewqqwer 5 hours ago | parent [-]

> assume it is the single client that will operate that account

You are still making wild assumption without actually thinking about what means to writing an email client.

	▲	fluoridation 5 hours ago \| parent [-]
		OK? Sure would be nice to hear why having a second email client talk to the remote server introduces race conditions on the local client (EDIT: that is, race conditions that are the local client's responsibility).