Unable to send emails: Communications Error: Socket connection to anymailserver.tld failed (error 10060)

Created:

2016-11-16 13:15:58 UTC

Modified:

2017-08-16 18:35:45 UTC

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Unable to send emails: Communications Error: Socket connection to anymailserver.tld failed (error 10060)

Applicable to:

  • Plesk 12.5 for Linux
  • Plesk 11.x for Windows
  • Plesk 12.0 for Windows
  • Plesk 12.5 for Windows

Symptoms

Unable to send emails from the server.

In MailEnable > Servers > localhost > Services and Connectors > SMTP > Logs > Debug > SMTP-Debug-xxxx.log the following information can be found:

02/07/16 08:44:11       ME-I0018: [0BCF8603898D4D25B155B5AFF7FB0FA4.MAI] Outbound message from ([SMTP:plesktest@example.com]) requeued as [FFEFCD05AA0A4CE9B2E74C7CAA6D8FE5.MAI] to the target domain [example.com]
02/07/16 08:44:11 ME-I0123: Domain [example.com] has MX list [mx1.domain.tld,mx2.domain.tld]
02/07/16 08:44:11 ME-I0026: [FFEFCD05AA0A4CE9B2E74C7CAA6D8FE5.MAI] Sending message
02/07/16 08:44:11 ME-IXXXX: [FFEFCD05AA0A4CE9B2E74C7CAA6D8FE5.MAI] DNS resolved to the following record: IP Address=203.0.113.2, Family=2, Type=1, Protocol=6
02/07/16 08:44:32 ME-E0038: [FFEFCD05AA0A4CE9B2E74C7CAA6D8FE5.MAI] Communications Error: Socket connection to mx1.domain,tld failed (error 10060). The host was either not contactable or it rejected your connection. Socket Family = 2; Host=203.0.113.2; Port=25

It's not possible to connect to any mail servers despite of the fact, that ports 25 and 587 are opened on firewall:

telnet mx1.domain.tld 25
Connecting To mx1.domain.tld ...Could not open connection to the host, on port 25: Connect failed

Cause

TCP ports 25 and 587 are blocked by ISP (Internet Service Provider).

Resolution

Contact your ISP regarding the issue.

Information about ISP can be found at http://whois.urih.com/ .

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