[paulgb]

Sure, but if you go on vacation and don't check your email for two weeks, you can't really claim “no warning”. If two weeks isn’t sufficient notice because of vacation it’s fine to say so, but it’s not the same thing as “no warning” just because you’re not checking email.

[stronglikedan]

To take it even further, if you're a one man operation, not checking emails regarding your operation for two weeks is pure negligence, vacation or not.