SMTP Error

[Joseph23]

Hi there,

Since a couple of hours I am unable to send emails through my RoundCube account. When clicking "Send", I get the following message:

SMPT Error (452): Failed to set sender "[email protected]" (4.3.1 Insufficient system storage).

I have deleted all unnecessary emails and am currently only using 4% of the storage.

Does anyone know what to do to resolve this? 

Thank you in advance!

[alec]

This SMTP server issue. Ask on another place.