Check to make sure you have Adobe Acrobat Reader 4.0 or higher.
If you are using Outlook Express and you get the error message that states: OE removed access to the following unsafe attachments in your mail: 1-23456/VAN.pdf. You need to alter your security settings.
The following instructions explain how to do this in Outlook Express.
Choose Tools, then select Options and click on the Security tab.
In the Options window look for a statement that reads "Do not allow attachments to be saved or opened that could potentially be a virus", uncheck this option and click Apply.
Wording and placement may vary depending on your operating system.
Go back to your email and you will now be able to open the attachment.
If you want to keep this security option on for future emails, simply re-check the option after you have printed the tickets.