Question / Problem
I kept getting a relay error after I sent 250 emails. The error stated that I was over my relay limit. My ISP says I have no limit and can send unlimited emails.
Answer / Solution
A relay error has its origin on the SMTP server used for sending mails. SmartSerialMail does not have any limit. If the server answers with a relay error you are either not authenticated or, like in your case, the server does have a limit. Please ask the administrator/provider of the SMTP server used for sending. There must be a limit, you can even send them your log of SmartSerialMail which proves that there is a limit.