Hello,
OK, I'm scratching my head hard. I know I am probably missing something trivial, but for the love of God I can't figure it out:
I have a lab here with DC01 and EXCH01 VMs. I attached the DNS config from Godaddy.
(for the sake of security, I removed the official domain I am using, let's assume it's lab.com)
Mailflow inside my network is working. Outside not - but not failing completely... let me explain:
Tx/Rx Outlook16 on my local machine = OK
Tx/Rx OWA = OK
Tx/Rx iPhone in WLAN = OK
iPhone on LTE = no autodiscover, no manual config, no Rx
mxtoolbox.com returns all green on MX
I can ping mail.lab.com, smtp.lab.com and autodiscover.lab.com.
I have two zones in my local DNS, lab.com and internal.lab.com. Lab.com is hosting two entries, autodiscover and mail, both pointing to the IP-Address of the Exchange Server.
In the Sophos:
Internal (Network) -> Email Messaging -> Any
DNAT Internet IPv4 -> SMTP -> Ext. WAN Address, Translate to EXCH01
That's about it.
Any ideas?
Thank you
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