Why do senders get a “554 Too many connections” error?
This happens with a mail server that routinely mass emails your domain.. We protect your domain from mass email attacks from spammers who can send millions of messages to your domain in just a few minutes resulting in mail server failures and huge bandwidth costs. Our “Rate Control” blocks prevent this from happening. If however you have services that routinely mass email your domain you need to provide us with the IP address of their outgoing mail servers so that we can add then to our “Rate Control” whitelist. This will prevent mail from those servers from being blocked when they mass email you. Their mail will however still be scanned for spam and viruses. Note that most services that mass email domains do not have a problem with these blocks as they retry the message a few times until it is delivered. Our service allows individual domains to connect to your domain up to 25 times every 30 minutes. Each of these connections can deliver up to 30 messages so as you can see even a busy
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- Why do senders get a "554 Too many connections" error?
