We are trying to use RoundCube for our parish and parish staff; we chose this option because we want to have e-addresses such as (name)@stalexanderparish.org These e-mails would identify both the individual and our parish, an option which is not available from other e-mail providers.
We can receive messages from all kinds of other servers, including AT&T. However, every time we try to send a message, we get an error message saying: "blocked by sbc:blacklist.mailrelay.att.net" and further "blocked for abuse".
AT&T has not been of any help in solving this problem. Are there any solutions?