Has anyone noticed this bug?
it's difficult to spot, since you won't be able to see it by yourself, but only the target domain, therefore let me show how we find it out:
1) we opened a dynamic host with dyndns, since our external IP was going to change and we wanted the REDs to reconnect as quick as possible (yes, we could have set-up an additional record and switch it, but with a very low TTL they would reconnect in minutes
2) to identify temporary records, i've used an host called like "_temp_red.domain.com"; it will appear on top and easy to spot among tens of other records...
3) Users started receiving back mails, stating that the target domain didn't accept the host "_temp_red.domain.com" with error
"501 Syntactically invalid HELO argument(s)" and indicating the dynamic host as source (it cannot be a reverse Ip lookup, for sure)
Most of the mails would be delivered therefore i figured out that only some mail servers were picky about the dynamic name.
What surprises me thou, is why the Astaro used the dinamic host as a helo identifier when esablishing an smtp session? I would have expected it to use the host found in SMTP Advanced settings under "SMTP hostname"...
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