Definition: Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.
Input: Question: I debated with my peers that we can use the word emails when referring to more than one and it would be grammatically right. But most of them said since we don't say we received mails today, similarly we won't say we received emails . Quick advice please. 
Answer: Emails and email are both correct plurals, but each has its own context. It depends on whether or not you are using it as a countable or uncountable noun. Email You can use email as an uncountable noun, just like mail. For example, "I received lots of email today" or "John sends me too much stupid chain email". But, you cannot use email as a countable noun. For example, "I have five email" makes as much sense as "I have five mail". Emails You can use emails as a countable noun, just like letters. Originally, email was always uncountable, just like mail. But over time, largely due to the ubiquity of use, pieces of email or email messages (and similar phrases) were shortened, and simplified to just emails. For example: "I have five emails" or "Kevin sends me too many emails". (Contrast that last one with "Kevin sends me too much email".) Of course, you can still use emails in some contexts where email is also acceptable ("I received lots of emails today"), but it does have a slightly different meaning (compare to "I received lots of email messages today") because you are using a countable versus uncountable noun.

yes