ISP:
UPC

Type of Internet Connection:
Cable

Internet Connection Speed:
150Mbits down 15Mbits up.

Date & Time:
2014-02-22 Around midnight

your region. (Example: Pacific Time = PST/PDT)
Amsterdam GMT+1

Frequency:
Always

Character Name:
Shirai N'yankoro

Race:
Miqo'te

World:
Sargatanas

Class/Level:
Pugilist 50

Area and Coordinates:
Ul'dah X12 Y8

Party or Solo:
Party 4 members

NPC Name:
PC interaction.

Monster Name:
PC interaction

In-Game Time:
Unknown

Steps:
A friend sends me a tell, I reply with a usual /r "reply" but it does not come through, the reply does not show up in my chatlog and is not recieved by the other party.
I have to alt+r or click and select "Send tell" to reply.

What you were doing when the issue occurred. (Example: Battle, mission, quest, crafting, synthesis, etc.)

Standing in town, waiting for Duty finder Garuda Hard mode initiated by a party member.