Hi Quiett,
If you have already created A mail.externaldomain.com in your DNS server, create one more A record autodiscover.externaldomain.com. 
You should have autodiscover.externaldomain.com and mail.externaldomain.com SANs in your certificate.
I hope you have configured your URLs in Exchange. http://www.mustbegeek.com/configure-external-and-internal-url-in-exchange-2013/

That's it.

At the ISP I have A record and autodiscover record set to mail.mycompany.com
and i have 3 san certificates from verisign mail.mycompany.com, autodiscover.mycompany.com, legacy.mycompany.com

and internally i have A record set for EX2013.mycompany.com, mail.mycompany.com and CNAME record autodiscover pointing to mail.mycompany.com
My Exchange Server name is EX2013 and do i need any host record for my server name at the ISP.

Hi Quiett,

autodiscover goes together with your mail domain, so if you had user@mycompany.com you need to create an autodiscover for mycompany.com ; it does not depend on your server url, if that does not match your mail domain.

You can create a record autodiscover like that

https://technet.microsoft.com/de-de/library/bb332063%28exchg.80%29.aspx

http://blogs.technet.com/b/rmilne/archive/2014/10/02/how-to-check-exchange-autodiscover-srv-record-using-nslookup.aspx

Let me know if it worked.

Regards,
Martin

I am a new to Exchange . I have installed Exchange 2013 CU7, i have configured all the external and internal URLs,

My exchange server name is EX2013.mycompany.com and all URS are mail.mycompany.com
What should be the autodiscover record, should it be mail.mycompany.com or EX2013.mycompany.com?
i have created a host record mail.mycompany.com and created CNAME autodiscover pointing to mail.mycompany.com
Am i going the right way?

• Edited by Quiett 4 hours 13 minutes ago e

• Edited by Quiett 3 hours 30 minutes ago e

At ISP you will have mail.domain.com

Hi Thanks alot for the support,

Do i require SPF record at ISP?

--------------------------------------------------------------

I have  an another Exchange 2013 server which is internal not connected to outside world, 

Do i require an internal MX record, send and receive connectors? 

• Edited by Quiett 2 hours 42 minutes ago e

No....
SPF is for Mai

Thanks alot for all the support

One final question , autodiscover record should be Host record or CNAME record.

Even CNAME should not be a issue

• Edited by Quiett 1 hour 22 minutes ago s

• Edited by Quiett Monday, February 23, 2015 7:39 AM e

• Edited by Quiett Monday, February 23, 2015 8:22 AM e

Hi Thanks alot for the support,

Do i require SPF record at ISP?

--------------------------------------------------------------

I have  an another Exchange 2013 server which is internal not connected to outside world, 

Do i require an internal MX record, send and receive connectors? 

• Edited by Quiett Monday, February 23, 2015 9:09 AM e

Thanks alot for all the support

One final question , autodiscover record should be Host record or CNAME record.

Even CNAME should not be a issue

• Edited by Quiett Monday, February 23, 2015 10:30 AM s