POP - Relay Access Denied
I recently installed Zimbra and I have slowly started migrating customers. I am sure this issue is addressed somewhere in the forums, wiki, or documentation; however, after an hour of searching while customers are complaining, I thought I would just post the question in hopes of a quick answer.
Basically, I have something setup wrong - at least I think.
My customers who are using an email client, for POP or IMAP, are unable to send messages. I have even tried to configure email clients, and I cannot get the SMPT connection test to work.
For Outgoing Mail Settings, I insert my mail server into the outgoing mail server box: I.e.: mail.servername.net
I then check the "Use Authentication" box, and I enter my full username: firstname.lastname@example.org.
Obviously, in the above examples, "servername" in the outgoing mail server settings, and "domainname" in the username settings can differ as I have multiple domains configured within the GUI Admin Console for Zimbra. I currently have 30+ domains for which we host email.
Any suggestions, or can someone point me to a previous thread? For some reason I am having a heck of a time finding documentation or threads on this.
Basically, my customers currently either cannot configure their email clients, or they are getting a 554 Relay Access Denied error.
Maybe I worded Incorrectly...
Thank you for the reply; however, after reading, I do not think that is exactly what I wanted. Let me try to explain more - please keep in mind that I will admit that I, definitely, may be misunderstanding something too.
I was thinking back to our existing Postfix mail server - prior to migrating to Zimbra. In the old setup I installed popb4smtp and added the needed settings to the main.cf to basically allow anyone who authenticated via POP to send mail via SMTP.
I guess I am looking to achieve the same thing; however, I was *assuming* (I hate using that word) that there was a better was of handling this via Zimbra besides installing popb4smtp. I.e.: my customers need to setup their mail clients to authenticate SMTP.
Basically, I am not looking to create a mynetwork list for all of my customers IP addresses; however, I also do not want to be an open-relay for sending email.