On Thu, May 14, 2020 at 09:07:29AM -0300, SysAdmin EM wrote:
> postfix-out/smtp: E30639204ED: to=<[hidden email]>,
> delay=1.4, delays=0.08/0/1.4/0, dsn=5.5.4, status=bounced
> (host hotmail-com.olc.protection.outlook.com[18.104.22.168]
> refused to talk to me: 501 5.5.4 Invalid domain name
The "refused to talk me" prefix means that the delivery attempt was
rejected either in the server's SMTP greeting or the EHLO response,
however the actual response also contains a 5.5.4 DSN status code,
which would only be appropriate in response to EHLO. Therefore,
the pattern was:
C -> S: TCP SYN
S -> C: TCP SYN ACK
C -> S: ACK
S -> C: 220 <server-hostnname> ESMTP ... <CRLF>
C -> S: EHLO <your-hostname> <CRLF>
S -> C: 501 5.5.4 Invalid domain name <CRLF>
The 501 code suggests a syntax issue, from which it seems that Microsoft
are claiming that your SMTP EHLO name is malformed.
Therefore, take a close look at your "smtp_helo_name" and "myhostname"
>I have two servers running on Postfix, one of which runs version 2.10.1 and
>the other server runs version 3.4.7.
>On the server where I am running verion 3.4.7, I receive "501 5.5.4 Invalid
>domain name" errors in emails sent to different servers. Rhe mail is sent
>to postfix through exim from a relay connection.
>The reverse of the IP is configured correctly and the From domain is also
># Log example
>postfix-out/smtp: E30639204ED: to=<[hidden email]>, relay=
>delays=0.08/0/1.4/0, dsn=5.5.4, status=bounced (host
>hotmail-com.olc.protection.outlook.com[22.214.171.124] refused to talk to
>me: 501 5.5.4 Invalid domain name [
is your hostname really "HK2APC01FT037.eop-APC01.prod.protection.outlook.com"?
Matus UHLAR - fantomas, [hidden email] ; http://www.fantomas.sk/ Warning: I wish NOT to receive e-mail advertising to this address.
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