OT: Co znamena tento mail.

[Martin Hanek]

Dobrý den,
provozujeme vlastní mail server na firemní doméně "domenafirmy.cz" a 
dnes přišel tento mail:
--------------------------------------------------------------------------------------------------------------------
Od: MAILER-DAEMON na domenafirmy.cz
Předmět: Successful Mail Delivery Report
Komu: noreply na domenafirmy.cz
Tělo:
This is the mail system at host domenafirmy.cz.

Your message was successfully delivered to the destination(s)
listed below. If the message was delivered to mailbox you will
receive no further notifications. Otherwise you may still receive
notifications of mail delivery errors from other systems.

                    The mail system

<servis na domenafirmy.cz>: delivery via local: alias expanded


Reporting-MTA: dns; domenafirmy.cz
X-Postfix-Queue-ID: 359A096C081D
X-Postfix-Sender: rfc822; noreply na domenafirmy.cz
Arrival-Date: Tue,  9 Nov 2021 08:44:47 +0100 (CET)

Final-Recipient: rfc822; servis na domenafirmy.cz
Original-Recipient: rfc822;servis na domenafirmy.cz
Action: expanded
Status: 2.0.0
Diagnostic-Code: X-Postfix; delivery via local: alias expanded


Return-Path: <noreply na domenafirmy.cz>
Received-SPF: softfail (domenafirmy.cz: Sender is not authorized by 
default to use 'noreply na domenafirmy.cz' in 'mfrom' identity, however 
domain is not currently prepared for false failures (mechanism '~all' 
matched)) receiver=server; identity=mailfrom; 
envelope-from="noreply na domenafirmy.cz"; helo=domenafirmy.cz; 
client-ip=87.246.7.39
Received: from domenafirmy.cz (unknown [87.246.7.39])
     by domenafirmy.cz (Postfix) with ESMTP id B0C8696C07B2
     for <servis na domenafirmy.cz>; Tue,  9 Nov 2021 08:44:47 +0100 (CET)
From: noreply na domenafirmy.cz
To: servis na domenafirmy.cz
Subject: *****SPAM***** domenafirmy.cz: E-Mail Administrator
Date: 8 Nov 2021 23:44:38 -0800
Message-ID: <20211108234438.267AC6A14C9B34DE na domenafirmy.cz>
MIME-Version: 1.0
Content-Type: multipart/alternative;
     boundary="----=_NextPart_000_0012_6DA0CD81.1CBC3A58"
X-MailScanner-ID: B0C8696C07B2.A4167
X-MailScanner: Found to be clean
X-MailScanner-SpamCheck: spam, SpamAssassin (not cached, score=21.67,
     required 5, BAYES_50 0.80, HTML_FONT_LOW_CONTRAST 0.00,
     HTML_MESSAGE 0.00, MIME_HTML_MOSTLY 0.43, MPART_ALT_DIFF 0.79,
     RCVD_IN_BL_SPAMCOP_NET 1.35, RCVD_IN_BRBL_LASTEXT 1.45,
     RCVD_IN_MSPIKE_BL 0.01, RCVD_IN_MSPIKE_L5 2.57, RCVD_IN_PBL 3.33,
     RCVD_IN_PSBL 2.70, RCVD_IN_RP_RNBL 1.31, RCVD_IN_SBL 0.14,
     RCVD_IN_SBL_CSS 3.33, RCVD_IN_XBL 0.38, RDNS_NONE 0.79,
     SPF_HELO_SOFTFAIL 0.73, SPF_SOFTFAIL 0.67, URIBL_BLOCKED 0.00,
     URI_PHISH 0.89)
X-MailScanner-SpamScore: sssssssssssssssssssss
X-MailScanner-From: noreply na domenafirmy.cz
X-Synology-Spam-Flag: Yes
--------------------------------------------------------------------------------------------------------------------

Co to znamená? Nějak jsem nepochopil, kde se vzal.
Ta IP adresa, co tam je, je někde v Anglii: 
https://whois.domaintools.com/87.246.7.39
Díky z vysvětlení.

-- 
Martin Hanek