We have 3 queues in OTRS and each queue is set with its own System Address. so for example product #1 queue all emails back and forth are sent by product1@company.com product #2 queue all emails back and forth are sent by product2@company.com We want to use otrs with Microsoft Exchange and in the Admin section under The Framework:Core:Sendmail we had the exchange settings and the AuthUser and Password which works. For the Exchange AuthUser and Password I use the SMTP exchange credentials for product1@company.com Problem is when someone uses product2@company.com to respond to users opening tickets in queue 2 they cant we are getting the error Can't use from 'product1@company.com' : 5505.7.1 Client does not have permissions to send as this sender i guess that basically means we cant use product1@company.com to respond to a queue product2 that has a system address of product2. Does that make sense to everyone. And is there a easy way around this. I do not think creating a generic ms exchange account that is just used for exchange authentication would help or am I wrong. Robert Recchia