Alright, I understand your messages get suppressed after you shout a couple of times, but I feel that the amount of time your messages are suppressed are excessively long. I understand it’s to prevent gold sellers from spamming (they just flood your mail either way), and to prevent general spam, but it really hinders people attempting to find a group or members for a group to accomplish a task.
In my server (Tarnished Coast) people tend to use Lion’s Arch as a central hub to find groups for story or explorable dungeons. With the spam block timer being the way it is people shout a couple of times then need to move zones or ask other members in their group to shout for them.
For example, I was seeking a group for explorabel TA or CoF and after a couple of shouts my messages were suppressed. 45+ minutes later my messages are still suppressed in Lion’s Arch.
You might want to consider reducing the timer or something.