On 8/2/22 16:46, Justin Case wrote:
The container uses the container ID as hostname. nothing I can do about it with
DNS.
I will retire the Synology mail server at somepoint but that is months in the
future.
I disabled authentication for local networks, but still:
504 5.5.2 <3422f1072002>: Helo command rejected: need fully-qualified hostname
Fix the Synology mail server instead of the container. Look at advanced
security rules (Mail Delivery > Security > Advanced) for the 'Reject
HELO hostnames without fully qualified domain name (FQDN)' and 'Reject
unknown HELO hostnames' rule settings.
On 2. Aug 2022, at 22:29, dmitri maziuk <dmitri.maz...@gmail.com> wrote:
On 2022-08-02 2:16 PM, Justin Case wrote:
I run the mailserver put its basically a tightly baked postfix dovecot under
Synology DSM UI. So I won’t manually change config files. But “Ignore
authorization for LAN connections” sounds reasonable, I have activated that
now. Lets see if that helps.
It has to know 172.x is a "LAN" connection... if they don't have a way to set
$mynetworks, I think you might want to add a raspi to your home lab to run a proper
postfix instance. ;)
This does, however, not solve the problem that the hostname is not an FQDN and
that it cannot be overridden with bsmtp. So I am still 100% away from a working
solution :(
It's common enough, half of them get "localhost" from the resolver anyway and happily
stick it in the mail header. I tend to specify From: addresses like
"win-acme-on-server-X@mydomain" to know where it came from -- and if anyone decides to
reply, they can keep the bounce.
As far as mail delivery goes, FQDN is not needed for anything. It's only there for that
UCE check which should be disabled for "LAN connections".
PS. if bsmtp gets its hostname from the resolver, you might be able to fool it
by setting up a nameserver for docker ips. Or maybe get names from docker
network -- but I never looked into that.
Dima
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