What is the largest size a received attachment can be? Google searches show people answering from 5 MB to 20 MB. When I sent something that was about 18.7 MB (19,200,200) it bounced with the error message:
(reading confirmation): 552 5.3.4 a message size of 20483 kilobytes exceeds the size limit of 20480 kilobytes computed for this transaction
