@Marvin_S Hi friend, Thank you very much for the reply but unfortunately none of the above solved the issue, Also I have tried the method of accessing the inbox from both external WAN and from mobile...

Model : TL-MR6400 Hardware : TL-MR6400 v5.3 00000002 Firmware : 1.4.0 0.9.1 v0001.0 build 220506 Rel.57555n Hi, I'm managing a TL-MR6400 which functions well for my business except lately I'm having...