1 votemelvinchi commented
Just noticed the comment about your iPhone SE. There is not an easy way to change this on the phone.
For this device you will need to add a DHCP option on your home network that sets the search domain. I think the option id is 119.melvinchi commented
Martian, I'm unsure of all the details but from what was provided this looks like a apex domain problem. You cannot have a A record and a CNAME record within the same domain scope for one. Second, a CNAME should never reference itself. Also a CNAME should never be on the apex domain.
Review this for help understanding different record types.
Again, I'm unsure of your setup but you can try on the apex domain creating a A record to point to router.
After that you can add a ALIAS record along side the A that points to the A record you just created. This will mean that both router.domain.com and domain.com would both point to your router.
For you to use just your router. I think you are on linux. You would just have to set your search domain to domain.com. This will allow you to just type router and it will return your routers IP. This works because a DNS lookup of a single string will append your search domain in the background.
This means you think you are using just router but what's being looked for is firstname.lastname@example.org
Hope this helps.
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