today I tried sending myself an attachment using webmail, and found a
bug? with last newline handling. Searching google 2 first hits returned
were 2 anomy-bugs messages ;)
In short: the last newline (0x0A) is stripped, message consists of three
attachments: text/plain, application/octet-stream and third without any
mime header [signature]), which misses trailing 0x0A.
Qmail gives error #5.6.2 if message is to be delivered remotely and
successfully delivers locally (which is strange).
If you need, I can send verbose log from message or provide url for
delivered messages (one sanitized).