We host a couple of web sites that have got a news subscription service. This week things have started to go a little weird. When a client sends an email out (one with 500+ subscribers, another with < 100), I get an email for both (I am in the subscriber list) but the error log gets most of the rest, with an error '550 Relaying is prohibited'. We have had these services running for a while now without a glitch. The mailserver is running exchange, and is on another machine. It it possible that there is a maximum number of emails that CFMAIL can send at a time ??
Does anyone know what the 550 error means, and a possible reason for/solution to the problem ?
Does anyone know what the 550 error means, and a possible reason for/solution to the problem ?