On 2021-03-28 17:49, Jacob Bachmeyer wrote:
Daniel Pocock wrote:
<[email protected]>: host eggs.gnu.org[209.51.188.92] said: 550 bad domain -
email
[email protected] for details (in reply to RCPT TO command)
<[email protected]>: host eggs.gnu.org[209.51.188.92] said: 550
bad
domain - email [email protected] for details (in reply to RCPT TO
command)
Those messages say "bad domain" ... either someone has very
specifically rigged the mail server to specifically reject your email
with a bogus error, or there was a very unfortunately timed
configuration error that caused a GNU MX to be unaware that gnu.org
exists. Considering that the former would require specially modified
code, while the latter could be the result of an innocent typo in a
configuration file, I would suspect the latter to be more likely.
Can we tell from that diagnostic which domain is the "bad domain";
To be confident, I would need inside information: what the mail
exchanger
is and how it is configured.
It is in response to a "RCPT TO" command, but that doesn't mean it
pertains only to the content of that command.
A mail exchanger can collect both the MAIL FROM and RCPT TO commands,
and then subject the SMTP connection to numerous checks that include
validating the sender's domain (given in MAIL FROM).
