Doublelist Email Message Error

For about a week now I have been unable to send messages on Doublelist. Every time I try to send a message, I get a “Message could not be sent” / “not sending” error on the messaging screen. Because of this, I cannot communicate properly with other users and the platform is practically unusable for me. I have not yet contacted Doublelist support, but I now want this issue to be checked and resolved. I kindly request that my account and messaging functions be examined in detail, that the sending error be fixed as soon as possible, and that I be informed clearly about the reason for this problem.