Please allow tells across servers.

[byJoso]

Except when you do that it says "Message to character@server could not be sent." Even when you double check with them that they're just standing in the city and aren't message blocked. Tested with multiple different characters on different worlds and data centers.

[JoeBarbarian]

Cross-world Tells already work. If it didn't then how would you message groups on Party Finder from other worlds. Tells don't work if someone is in an instance, so I assume the people you tested it on where in an instance or in a zone they couldn't be contacted from. Just gave it a go and was able to /tell someone on Phantom when I'm on Spriggan.

Cross-datacentre Tells would be nice however it's still new so that may be a feature in the future, along with making Party Cross-DC.