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![]() ![]() Some important resource control parameters used to manage Exim in cPanel and DirectAdmin servers are:Ĥ21 ‘Too many connection’ error – Settings for Exim in cPanel and DirectAdmin Without proper resource limits in place, one user or application can take up the entire memory for that process and cause the mail server to crash. ![]() Resource control is crucial in a shared server where multiple users share the resources. In Exim mail server, there are many parameters to ensure ‘Resource control’. The default mail server they use is the Exim. ![]() ‘Too many concurrent SMTP connections’ error in Exim mail server for cPanel and DirectAdminĬPanel and DirectAdmin are the two commonly used control panels in web hosting industry. The solution for the error would depend on what caused the high traffic. Virus or malware in the server can enable the attackers to abuse the email server for spamming.Īll these issues lead to a high mail server traffic and can end up bouncing mails coming to it. There could be some websites that have mass mailing scripts such as newsletters. This high traffic can sometimes be a temporary problem due to a spike in the connections.īut there maybe some other situations where the traffic is dangerous and expert intervention is required. For instance, spammers can hack email accounts and send bulk mails. The error message denotes that the connections to the recipient mail server have exceeded the limit. Senders sending mails to a high traffic mail server can end up getting bounce mails. The error message in the bounce mail would usually be ‘421 Too many concurrent SMTP connections please try again later.’ See how we resolve email errors in your sites! What causes ‘Too many concurrent SMTP connections’ error? This error usually denotes a high-traffic recipient mail server. Managing and troubleshooting mail servers forms a vital part of the Outsourced Website Support services we provide to shared server owners.Īmong the common mail server errors, 421 is a common one that happens due to ‘ too many concurrent SMTP connections’. ![]()
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