"Thank you" for the first occurrence in a message, then "thanks" is permissible within the same message.
The problem with "No problem" is that in current usage it has lost its specific meaning: when you really do want to convey the sentiment that your effort wasn't a problem for you (Jamaicans get a pass); similar to "what's up?" which used to mean "you wanted my attention?" - it's now (drearily) used for "hello."
Do Brits still think "You're welcome" is strange?
Last edited by Manalto; 08-22-2015 at 12:54 PM.