The most common and most likely answer to this crossword clue is the 6 letter word E-MAIL
I've seen this crossword clue in Independent
E
-
M
A
I
L
More clues leading to the result E-MAIL
- Messages your compiler rejected are sick
- . Fib upset Mum in online message
- Message put about in parliament
- I will block return of unimpressive spam?
- Messages in echo Irishman sent back
- Suffer under a measure of junk, maybe
- Letter travelling at the speed of light?
- Correspondence review in April – I am engaged somewhat
- Message European man via a mobile phone
- Message press raised mum’s taken in by
Buddy explains!

The straight part
We know that "spam?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case spam? = e-mail.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does E-MAIL mean?
E-MAIL noun- A system for transferring messages from one computer to another, usually through a network.
- A quantity of messages sent through an email system.
- A message sent through an email system.
- An email address.
- To send an email or emails to.
- (may take two objects) To send (something) through email.
- To send, or compose and send, an email or emails.
- Enamel.