Like you, I get an email.
There is a highlighted link in it...lovely green thing waiting to be clicked to take me to this fabulous location sent to me by a friend....and the bloody thing doesn't work.
Fix it with:
Opening the beloved Sylpheed email client.
Configuration>Common Preferences>>Details>External Commands
Attachment:
Common Preferences_021.png [ 45.89 KiB | Viewed 10774 times ]
Change the Web browser line to fit.
Ok....and you're good to go.