I have been using Gossamer Mail in production use now for a week and it is working great. I had Gossamer make customizations which utilize auth_mysql for authenticating users. I use one master database for authenticating my entire site including discussion forums.

In addition I had a feature added that requires users to respond to a code sent to their permanent email account before activation. A word of warning though this option ends in lots of support questions from confused users. In the beginning I found I had 10% requiring assistance, now it is closer to 5% after some instructional verbage modification.

Support from Gossamer-threads has been fantastic.

The only must have feature that missing is the automatic bouncing of messages sent to users who do not exist. This is really needed badly as I now have 1000 users registered under the catch all system and it is easy for mail to get lost. As a system administrator what happens is users do not get their mail from friends because they mispelled something. Because the message never got kicked back when user finds out the message disappeared they blame it on the crappy email system when it was really a misspelled username on the senders part. Since they never get a return mail message back they never know it did not make it do its destination.

Todd