Topic: I might need some migrating tips...
As this forum gave me a fast and working answer to my question last time, i'll again want to ask something to the community and/or devs.
We're planning to migrate about 360 users from our ISPs Mail-Server to a brand new and totally sparkling iRedMail-server. The server is running without any problems and everything works like a charm. The only problem I've got atm is that I don't exactly know how to migrate all the users.
My plan was to fetch the mails via fetchmail from our ISPs Server (only POP3 available) to the iRedMail server and configure postfix to use the ISPs SMTP-server as a relay for sending the mails. While testing this worked wonderful when I used a different domain dedicatet for testing, but now as i'm working with the "real" domain I faced some troubles I can't solve on my own.
The smtp-relay relatet stuff all works. I can send mails and thei're correctly delivered.
When i fetch the mails with fetchmail, they are correctly picked up from the ISPs server and correctly delivered to the iRedMail server. The only problem is that postfix (who should be responsible for delivering mails to the local dirs) is configured to use the relay-settings. Example:
1) Fetchmail picks up the mail from email@example.com and delivers it to postfix.
2) Postfix looks up the mail-adress firstname.lastname@example.org which is actually configured in iRedMail and on the ISPs server.
3) Postfix then delivers the mail back to my ISP and not to localhost(I guess it's because of the smtp-relay configuration)...
4) INFINITE LOOP, YAY
What I'm thinking atm: Maybe my approach is not that good anyway.
Are there any tips for migrating many users from an old server to a new iRedMail-server who both run under the same domain. I don't have any access to the ISPs Mail-Server btw. I only got access to a very basic web-interface with like, no options... Thanks in advance for your thoughts!