Unable to send mails form Roundcube

[wdeboer]

Since a few weeks I am having issues with Roundcube tha tit doesn't allow users to send emails. The logfile of Roundcube says the following about this:

25-Feb-2009 13:35:35 +0100] SMTP Error: SMTP error: Authentication failure: Invalid response code received from server (Code: 454) in /var/www/html/roundcubemail-0.2/program/steps/mail/func.inc on line 1248 (POST /roundcube/?_task=mail&_action=send)

Not sure how I can fix this issue. Earlier today I have updated Roundcube but that didn't fix it.

Anyone know how I can solve this issue?

 

[scsi]

Did you setup exim to require authentication? It should be allowing open relay from 127.0.0.1

 

[wdeboer]

Not that I am aware off. I already tried to change the port to 25 which was on the SSL port in the main.inc.php file of Roundcube. No luck.

How can I add that relay thingy? I don't think it's using a SSL certificate now.

 

[wdeboer]

Anyone know a way how to fix this?

 

[tillo]

One thing I noticed with RoundCube is that users authenticated without a complete email address (system users) have by default a From address <user@localhost>.
This creates two potential problems: if "localhost" is not in the local domains list in exim.conf it triggers a relay error, and if the destination doesn't accept the localhost domain as sender the Email get frozen because the error can't get back to the user.
The solution is simple, just modify the sender address from <user@localhost> to <user@domain> in the RoundCube settings for any system user.