There are 2 unfortunate realities here:
1. People rely on emails, and will continue to do so.
2. Emails get filtered for whatever reason, and no one gets told about it.
One person told me he once called netsol to find out why he's not getting his
emails using their mailboxes. They eventually had a 3-way call with the guy's
ISP, Road Runner.
It turned out Road Runner blocked out any emails bearing the words "network
solutions". It took a while, but eventually they allowed netsol's emails to be
allowed thru their system.
Bottom line: emails aren't as reliable as they used to be. Use other means at
your disposal.