How can I ask, "Will this email address be removed from this mail group?"
You can say "这个邮件地址会被邮件组删除/移除吗？". First, you need to catch the important words in this sentence. " email address"(邮箱地址),"removed"(移除) and "mail group" (邮件组). You can make a sentence with these three words in a logical order. " will" is future tense, so you need to use "会".