For background info, I operate behind a DHCP non-commercial connection, and late last month I tried having one of my three domains run with BIND on my Virtualmin server. The FQDN’s were bought at Google Domains. On Google’s DNS settings I turned off the DNSSEC, waited two days, then switched from Google’s nameservers to mine on my Virtualmin server, and waited a couple more days. Things worked right for the most part, but my main goal was to have eMail and all the features work right (
DMARC). I came close, but because
Spamhaus ZEN and
SORBS DUHL blacklisting my IP, I still had to bounce messages off MailGun for general delivery to the masses (Yahoo!, Gmail).
I decided to roll-back and have Google be the nameserver and DNS record giver again. I was going through the DNS entries on Virtualmin and putting the appropriate ones on Google.
Virtualmin => Server Configuration => DNS Records | [Manually Edit Records].
One thing I never saw before was a section in the file that looked like this:
_autoconfig._tcp.MYFQDN.tld. 3600 IN SRV 0 1 80 mail.MYFQDN.tld. _autodiscover._tcp.MYFQDN.tld. 3600 IN SRV 0 1 80 mail.MYFQDN.tld. _imap._tcp.MYFQDN.tld. 3600 IN SRV 0 1 143 mail.MYFQDN.tld. _imaps._tcp.MYFQDN.tld. 3600 IN SRV 0 1 993 mail.MYFQDN.tld. _pop3._tcp.MYFQDN.tld. 3600 IN SRV 0 1 110 mail.MYFQDN.tld. _pop3s._tcp.MYFQDN.tld. 3600 IN SRV 0 1 995 mail.MYFQDN.tld. _submission._tcp.MYFQDN.tld. 3600 IN SRV 0 1 587 mail.MYFQDN.tld.
I don’t know how it got there, and it vanished sometime between the roll-back and the time of writing this. If I hadn’t transposed them to Google, I wouldn’t have been able to say what I saw!
I was going to put similar records on Google for the other two domains, but couldn’t find them or figure out how to have them appear by clicking buttons in Virtualmin.
So my question is, why were they there, and how did they get there? Are they meaningless on the Google DNS custom resource records? I don’t see the K-9 Mail guessing right from autoconfigure, so is that K-9’s fault or mine for not having a static IP to work with?