No emoji or smiley face anything in professional emails. Sad, but true. {I wish I could insert a sad emoji right here.} Keep everything clear and concise. Write an email like you value the other person’s time. Get to the point. Of course, you still want to communicate effectively, but no need to write a dissertation on the subject.
If you are going to use your own phone to record your greeting, be sure to use a land line. Cell phones can’t always be trusted to produce a high quality sound and often the callers will hear distortion, static, or flight information in the background because you decided to record a new message while waiting for your plane at the airport. Always use a land line in a quiet setting to make your recording.

A word of warning: These greetings will not do you any favors if you're in the midst of a job hunt or work in a conservative industry. Always remember your target personas. If there's a chance they won't appreciate your sense of humor, opt for a straightforward greeting instead.
Voicemails can give an important message or inform the caller about the receiver's status. Thus, it is important for you to be clear while recording such messages. Here are a few examples of voicemail greetings to get an idea about appropriate messages that can be recorded the next time you leave your house or desk.