In a formal / professional email (i.e. emails directed at potential employers, co-workers and administrators), is it okay to exclude the greeting after the first email?
For example, I will send an email in the form:
I will typically then receive an email of the same form. After this point, is it necessary to keep including a formal greeting, or even a formal salutation?
I generally do not keep saying "Hello" (or include any other greeting) in the same email thread after having said it once in the initial email. I may include another greeting if I am emailing the same person after at least a day in between emails, or if starting a new email thread.
I will also generally omit the salutation and just place my name or signature at the end of the email after the initial greetings / emails as well.
What are everyone's thoughts on this? I am referring specifically to formal and professional situations and not casual emails with friends or co-workers who you may have already been working with for a while.