Why does a html message open as plain text?

[nopaisan]

I signed up to receive weekly "specials" from different airlines. They each
arrive okay in html, except one which has started appearing in plain text and
is mostly just a string of links. What setting do I have to change that
would only affect this one sender? Is this something in Outlook or with my
mail service? Note that my wife sees the same messages because we are
"networked", and when she opens the same message with Outlook Express she
sees html!

 

[Brian Tillman [MVP - Outlook]]

I signed up to receive weekly "specials" from different airlines. They each
arrive okay in html, except one which has started appearing in plain text
and
is mostly just a string of links. What setting do I have to change that
would only affect this one sender? Is this something in Outlook or with my
mail service? Note that my wife sees the same messages because we are
"networked", and when she opens the same message with Outlook Express she
sees html!

One common cause of this is having your antivirus program configured to scan
mail. Uninstall your AV program and reinstall it without the mail scanning
feature.