Zimbra as a relay host - some ISPs seems to block our mails

[X-Dimension]

I've configured ZCS as a relay host like in this how to:

Outgoing SMTP Authentication - Zimbra :: Wiki

Mostly it works fine, but it seems that some ISPs are blocking our mails.
Any ideas how to fix this?

[phoenix]

Originally Posted by X-Dimension

I've configured ZCS as a relay host like in this how to:

Outgoing SMTP Authentication - Zimbra :: Wiki

That isn't setting Zimbra as a rleay, it's using your ISP as the relay.

Originally Posted by X-Dimension

Mostly it works fine, but it seems that some ISPs are blocking our mails.
Any ideas how to fix this?

Not really, you haven't told us anything about the ISPs that block you nor the reason for being blocked - that would be a staring point.

[X-Dimension]

In which log file are these infos?

[phoenix]

Originally Posted by X-Dimension

In which log file are these infos?

Log Files - Zimbra :: Wiki

Please update your forum profile with the output of the following command (do not post it in this thread):

zmcontrol -v