Too Many concurrent Users

[patturkington]

Does anyone know exactly why this occurs and how to overcome the following:

An unknown error has occurred. Account: 'Nick Banks', Server: 'smtp.bankspottery.co.uk', Protocol: SMTP, Server Response: '421 Too many concurrent SMTP connections; please try again later.', Port: 25, Secure(SSL): No, Server Error: 421, Error Number: 0x800CCC67

[thewebhosting]

Kindly refer to below mentioned URL which might helps you to solve your issue:

Outlook Express error - 0x800ccc67

[FilipeCardoso]

Hello, I've got this same error , but it also occurs in webmail, horde / squirrelmail / RoundCube / outlook, there is no command that can be performed to correct the problem?

erro:

Houve um erro ao enviar esta mensagem: Failed to connect to localhost:25 [SMTP: Invalid response code received from server (code: 421, response: Too many concurrent SMTP connections; please try again later.)]