Mr Moo, Foxmail at best is a piece of shit. As an email client I have faced quite few problems that can only be fixed by replacing it. But in the mainland they grip onto it as it was the ultimate thing in messaging. I recall how everyone company we service had no issues except this guy on Fucksmail. The china firewall was having a bad day and he was not able to re-route his smtp and pop3 to non-standard ports. He was without mail for a day. Called us many times trying to see what we could do. The idiot.
Whilst programs like Norton and other anti-virus cause problems, the problems Server "reconfigurations" are far a big problem as they affect many people in one go, particularly when some ISP has hired some fuck-wit that wants to "tune the servers". Eg, only retry deliver twice and then drop the email.
Then there are all these great anti-spam hardware appliances "linux boxes spray painted a cool colour" which don't implement smtp properly.
I like those ISPs that have a queue full of spam and to solve the problem they just delete the whole queue contents including real email.
The problem of lack of bandwidth is very rare but routing problems still do affect the Internet. Years ago when we were single homed we would see floods of email from backbones or networks that could not see us for hours and suddenly a huge amount of email would come out of one or two AS's (autonomous systems/backbones).
I am sure there is a bunch of people reading this saying "I have no problems with message loss", yeah that is what you think. You only get to find out if you lost mail when someone picks up the phone and calls you.
At least for we get to identify the sources of the problems and we get to sort them out, but it is a hassle and increasing in frequency to a few times a week.
Mr Moo I can't read your PDF. try encoding it with something older.