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Ahoj,

jen pro info, Vídeňské MX servery UPC, ze kterých se posílají e-maily do světa (ty se ně dostanou z oficiálního SMTP serveru mail.upcmail.cz) jsou na Sorbs.net SPAM listu.

Vím minimálně o :

  • vie01a-dmta-pe05-3.mx.upcmail.net [84.116.36.13]
  • vie01a-dmta-pe07-1.mx.upcmail.net [84.116.36.17]

Ale podle výpisu z jejich databáze je toho víc:

Problem Entries, (listings will cause email problems.)
2893 "Spam" entries [14:24:54 01 Aug 2018 GMT+00].	
84.116.36.100 - 1 entries [08:44:30 31 Jan 2018 GMT+00].	
84.116.36.102 - 1 entries [14:57:43 22 May 2017 GMT+00].	
84.116.36.11 - 331 entries [22:06:59 30 Jul 2018 GMT+00].	
84.116.36.115 - 3 entries [16:13:13 25 May 2018 GMT+00].	
84.116.36.116 - 5 entries [03:34:09 13 May 2018 GMT+00].	
84.116.36.117 - 3 entries [05:02:01 11 Jun 2018 GMT+00].	
84.116.36.118 - 11 entries [12:43:29 13 Jun 2018 GMT+00].	
84.116.36.119 - 1 entries [23:02:23 04 Jun 2018 GMT+00].	
84.116.36.12 - 157 entries [15:17:33 30 Jul 2018 GMT+00].	
84.116.36.120 - 3 entries [19:18:22 04 Jul 2018 GMT+00].	
84.116.36.13 - 144 entries [10:13:58 31 Jul 2018 GMT+00].	
84.116.36.14 - 322 entries [14:06:25 31 Jul 2018 GMT+00].	
84.116.36.144 - 52 entries [07:25:52 11 Dec 2017 GMT+00].	
84.116.36.145 - 91 entries [16:33:10 31 Jul 2018 GMT+00].	
84.116.36.146 - 50 entries [15:12:44 15 Jan 2018 GMT+00].	
84.116.36.147 - 24 entries [22:37:35 12 Apr 2018 GMT+00].	
84.116.36.148 - 15 entries [01:46:28 07 Dec 2017 GMT+00].	
84.116.36.149 - 19 entries [23:22:19 21 Jun 2018 GMT+00].	
84.116.36.15 - 157 entries [08:30:59 30 Jul 2018 GMT+00].	
84.116.36.16 - 141 entries [10:15:00 01 Aug 2018 GMT+00].	
84.116.36.17 - 313 entries [08:31:13 31 Jul 2018 GMT+00].	
84.116.36.18 - 158 entries [07:06:39 01 Aug 2018 GMT+00].	
84.116.36.19 - 165 entries [06:11:01 30 Jul 2018 GMT+00].	
84.116.36.20 - 340 entries [16:19:26 31 Jul 2018 GMT+00].	
84.116.36.21 - 158 entries [01:18:45 30 Jul 2018 GMT+00].	
84.116.36.22 - 154 entries [14:24:54 01 Aug 2018 GMT+00].	
84.116.36.66 - 1 entries [14:08:24 03 Feb 2018 GMT+00].	
84.116.36.68 - 2 entries [16:04:02 23 Mar 2018 GMT+00].	
84.116.36.91 - 13 entries [13:15:38 28 Jul 2018 GMT+00].	
84.116.36.92 - 9 entries [16:43:36 13 Jul 2018 GMT+00].	
84.116.36.93 - 17 entries [02:47:38 31 Jul 2018 GMT+00].	
84.116.36.94 - 12 entries [13:15:37 28 Jul 2018 GMT+00].	
84.116.36.95 - 8 entries [19:43:19 13 Jul 2018 GMT+00].	
84.116.36.96 - 12 entries [19:32:56 31 Jul 2018 GMT+00].

Některé MX servery z tohoto seznamu se používají jen pro určité země, např. vie01a-dmta-hu02-1.mx.upcmail.net [84.116.36.68] pro Maďarsko, takže to vypadá na globální problém.

Typická odpověď z cílového mailserveru, který blokuje příjem z MX serverů UPC:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  prijemce@server.cz
    host server.cz [x.x.x.x]
    SMTP error from remote mail server after RCPT TO:<prijemce@server.cz>:
    554 5.7.1 Service unavailable; Client host [84.116.36.17] blocked using dnsbl.sorbs.net; Currently Sending Spam See:
    http://www.sorbs.net/lookup.shtml?84.116.36.17

Return-path: <odesilatel@karneval.cz>
Received: from [172.31.216.44] (helo=vie01a-pemc-psmtp-pe02) by vie01a-dmta-pe07.mx.upcmail.net with esmtp (Exim 4.88) (envelope-from <odesilatel@karneval.cz>) id 1fkqaT-0000NM-Jd for prijemce@server.cz; Wed, 01 Aug 2018 14:50:45 +0200
Received: from DomaciPC ([x.x.x.x]) by vie01a-pemc-psmtp-pe02 with SMTP @ mailcloud.upcmail.net id Hoqf1y00T0h8wqZ01oqgM7; Wed, 01 Aug 2018 14:50:43 +0200
X-SourceIP: x.x.x.x
X-Authenticated-Sender: odesilatel@karneval.cz
Message-ID: <34AC7D08BAD541719FA329A9D5BB3AE1@DomaciPC>
From: ... <odesilatel@karneval.cz>
To: <prijemce@server.cz>
Subject: ...
Date: Wed, 1 Aug 2018 14:50:39 +0200
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="----=_NextPart_000_0091_01D429A7.037C6BF0"
X-Priority: 3
X-MSMail-Priority: Normal
Importance: Normal
X-Mailer: Microsoft Windows Live Mail 15.4.3555.308
X-MimeOLE: Produced By Microsoft MimeOLE V15.4.3555.308
X-Exim-DSN-Information: Due to administrative limits only headers are 
returned

Technická podpora UPC samozřejmě kontaktována, ale poslední odpověď je, že nejsou schopni s tím cokoliv udělat.
 

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Podle aktuálních informací, se to již řeší. Zatím jako náhradu se má použít smtp.dkm.cz pro odesílání e-mailů. Tedy:

SMTP Server: smtp.dkm.cz
Port: 465
Zabezpečení: SSL/TLS
Přihlášení: už. jméno/heslo k e-mailové schránce UPC 

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