exchange srv record ISP

Question

dears,

i have an exchange server configured. the public certificate is purchased with just one san :mail.domain.com.
autodiscover.domain.com isnt included in the SANs
externally, autodiscover is published via SRV record and it is working fine
i have 2 questions please:

1. if i publish autodiscover with cname record will it work with warnings? because isnt included in the certificate or autodiscover won't even be working
2. my records are being published now on ISP1 and autodiscover is working with srv record like i previously mentionned, my issue is when im switching my records to ISP2 (goddaddy) all my domain records mx,srv... autodiscover stops working. can you advise ? why it is working on isp1 and not on isp2. what could be the issue

thank you in advance

Answer 1

Hi,

Please find the below suggestions,

1. Yes, it will work with CNAME since mail.domain.com is in the certificate

Refer Step 4 in this article https://learn.microsoft.com/en-us/exchange/plan-and-deploy/post-installation-tasks/configure-mail-flow-and-client-access?view=exchserver-2019

2. I would suggest to check with ISP support for this because it could be an issue with DNS replication/record syntax/Nameservers, etc

Answer 2

thank you for your continuous support.
lets rake this scenario: just mail.domain1.com included in san and autodiscover is published externally pointing to mail.domain1.com.
lets say i added a new domain domain2, as i wont wanna include autodiscover names in the certficate. will i be able to make autod work on the second domainn if i publish it externally as an srv record pointing to autodiscover.domain1.com??

will it work if i publish it as cname? like aut.domain2.com pointing to auto.domain1.com?

thank you again

Answer 3

Hi @eg1995 ,

Regarding the 2 questions listed in your original post, agree with the suggestions provided above by @Ashok M .

As per your new concern about using the same certificate for a new domain, yes, that would work with CNAME or SRV record. To add to what AshokM-8240 mentioned, here is an official blog with the configuration steps to add a CNAME record for new domain:
Exchange 2007 AutoDiscover and Multi-Tenant Hosting

That was an old blog so the SRV record method wasn't covered, but as stated earlier, SRV record is also a solution. Here is an article for your reference:
Autodiscover for multiple domain without changing single SSL cert

Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

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