On 5/4/19 3:44 AM, Vytis Marciulionis via mailop wrote:
DNS Error: 6443565 DNS type 'mx' lookup of example.com responded with code NXDOMAIN Domain name not found: example.comHas anything changed and now we can consider "no MX record" a valid reason to not deliver messages to that domain?
NXDOMAIN means that the domain itself doesn't exist, independent of the record type.
NODATA means that the domain itself does exist, just not the record type you asked for.
So Google saying NXDOMAIN means that the domain doesn't exist and there is no point doing a subsequent lookup for an A record.
Or maybe it was always a good idea to discard receiving domains without any MX records?
I question why your SMTP server even accepted the email with a non-existent recipient domain in the first place. If it was Gmail, maybe they did so specifically so that they could generate a bounce that might be more informative than a terse SMTP error message.
-- Grant. . . . unix || die
smime.p7s
Description: S/MIME Cryptographic Signature
_______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
