@girish said in What's coming in Cloudron 9:
Since many IPv6/PTR issues have been reported, I revisited the code to double-check.
I found two biggish bugs:
There was a typo in the IPv4/IPv6 caching code Because of this IPv6 will sometimes be returned as undefined
On versions less than Ubuntu 24, unbound was configured to use IPv6 . Zen SpamHaus is not replying IPv6 queries for most of the public VPS providers . I made a fix to make unbound use IPv4 to query SpamHaus.
Finally, I also added IPv6 DNSBL checks . Also, double checked that SPF record "a:" includes AAAA .
I am hoping this helps the situation. If not, we can add a flag in 9.1 to make the mail server not use IPv6 at all.
With some much needed Mail improvements, I just wanted to raise this one to your radar in case this can make it in for 9.0 at all. I’m surprised this isn’t making bigger headaches for people, likely just a particular set of circumstances, but I think this is an important fix or improvement to include if we can.
https://forum.cloudron.io/post/109707