Question Plesk Mail Autodiscover

[Mistral]

Hi,

Does anyone know the TTL for plesk autodiscover records?
I have shutdown the service yesterday about 20 hours ago and it still finds the plesk autodiscover first.
I've tried looking at the knowledge base but doesn't have a note included with the TTL of the records it would add.


Thank you in advance.
Mistral

 

[Kaspar@Plesk]

I believe the default TTL for any DNS record managed trough is 24 hours. You can check the current TTL of your own records with an online lookup tool like MXtoolbox.

 

[Mistral]

Hi Kaspar,

Thank you for the quick answer.

I've confirmed my DNS records. Those are all set.
Unfortunately Outlook first looks for: https://<domain>/autodiscover/autodiscover.xml
And after that it will look locally, CNAME and after that SRV.
I am using a SRV record.

Currently it still finds the .xml from before disabling the plesk autodiscovery.
How can I remove the autodiscover.xml from the domain? Or did I missunderstand and the .xml has a TTL of 24 hours.



Thank you in advance,
Mistral

 

[Kaspar@Plesk]

You mean you have SRV records for the domain pointing to another server? But Outlook stil uses the autodiscover configuration from the Plesk server?

Or did I missunderstand and the .xml has a TTL of 24 hours.

No, the XML has no TTL.

 

[Mistral]

You mean you have SRV records for the domain pointing to another server? But Outlook stil uses the autodiscover configuration from the Plesk server?

Yes exactly. The site is hosted using wordpress.
I want Outlook to not find or skip the autodiscover .xml from Plesk. (https://<domain>/autodiscover/autodiscover.xml)
I've tried adding RewriteRule ^autodiscover/autodiscover.xml$ - [forbidden,last] to the .htaccess file, but that does not seem to do the trick.

 

[Mistral]

Any suggestions how I can remove the .xml from the domain?
Or atleast make it unreadable.

The autodiscovery prioritizes the .xml before checking DNS for SRV records.
I need it to find the SRV for it to go to the right mailserver.

 

[Kaspar@Plesk]

I haven't been able to reliably replicate this. It suspect that the way Outlook utilizes autodiscovery (if supported) might work different in depending on the Outlook version.

What Outlook version are you using?

 

[Mistral]

Hi Kaspar,
I am currently using Microsoft 365 MSO (Versie 2405 Build 16.0.17628.20006) 64 bits, the latest build.

 

[Kaspar@Plesk]

Autodiscovery for Outlook 365 isn't supported in Plesk, as Outlook 365 gets autodiscover configuration using Microsoft cache servers as proxy servers rather then directly from the mail server. Which would explain why even trough autodiscover is disabled on your server, Outlook tries to make it's own connection (independent of your server configration).