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Knowledgebase : On-Demand > Error Responses
   

In order to ensure that all of our customers can get the maximum possible performance out of our system, we limit our server to accepting up to 10 concurrent connections from a particular account. If you are using a system that requires frequent sending...
Each and every server on the SocketLabs On-Demand platform comes with a certain allotment of email messages, bandwidth, and API calls made available to the account over the course of a month.  Each server has a unique setting for both messages and bandwid...
In order to ensure the best performance in mail delivery for all of our customers, our servers are configured to allow a maximum of 500 recipients in each message.  This includes any recipients in the TO, CC, and BCC fields of your message. If y...
Like many other service providers, SocketLabs On-Demand services require a username and password to access your account.  The above response from our SMTP servers indicates that the credentials you have sent to our servers do not match the settings we hav...
Like many other service providers, SocketLabs On-Demand services require a username and password to access your account.  The above response from our SMTP servers indicates that you have not attempted to authenticate or send any login credentials to our s...
Internet mail protocol standards dictate precisely what the format of each sender and recipient address can be, and our service will reject any messages sent that do not meet these standards. Typically, when users receive this error it's due to a syntax...
Internet mail protocol standards dictate precisely what the format of each sender address can be, and our service will reject any messages sent that do not meet these standards. Typically, when users receive this error it's due to a syntax error in the ...
To ensure the best sending rate for our customers and to accommodate for message rules in place by some ISPs, we limit the maximum total size of any message sent to 40MB or less. Internet mail protocols are not designed as a file transfer protocol, and...
This is the response our platform returns if you are trying to send a message using a domain or address that is not present on a server's Deliver From Whitelist, or if the domain or address is specifically blacklisted from processing messages through a sp...
If you are having problems connecting to smtp.socketlabs.com there are some basic tests that can be performed to diagnose the issue that is occurring.  It is important to understand that smtp.socketlabs.com is designed as a highly available system.  Since...
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