On 2022-08-01 3:57 PM, Justin Case wrote:

bsmtp: bsmtp.c:124-0 Fatal malformed reply from mailserver.dummy.net: 504 5.5.2 
<3422f1072002>: Helo command rejected: need fully-qualified hostname

Who runs the mailserver? Typically you's set "permit-mynetworks" before "reject-XX-helo-hostname" and add the docker ip ranges to "mynetworks" -- assuming it's postfix.

Since docker uses private ip ranges, these ips should never appear on "the Internet" side of the mailserver, i.e. it's not opening the relay for everyone: only to docker containers (which could be a problem too dep. on how far they trust their customers).

$.02
Dima


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