Hello, have problem with outgoing mails, Exchange server 2013,  everything was working till today, but now mails are not sending they are listed in queue list, but still receiving mails!

Hi,

Do this issue is for internal or external users?

Try to run the shell command and post the output.

Get-Queue | FL *error*

Regards

Vickram M

Here is output of shell command:

LastError : [{LRT=7/8/2015 3:20:58 PM};{LED=441 4.4.1 Error encountered while communicating with primary target IP
            address: "Failed to connect. Winsock error code: 10060, Win32 error code: 10060." Attempted failover to
            alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all
            alternate hosts. The last endpoint attempted was
            108.171.215.180:25};{FQDN=rionipec.com};{IP=108.171.215.180}]

LastError : [{LRT=7/8/2015 3:21:34 PM};{LED=451 4.4.0 Error encountered while communicating with primary target IP
            address: "421 4.2.1 Unable to connect." Attempted failover to alternate host, but that did not succeed.
            Either there are no alternate hosts, or delivery failed to all alternate hosts. The last endpoint
            attempted was 79.175.161.16:25};{FQDN=pardisfakhr.com};{IP=79.175.161.16}]

LastError : [{LRT=7/8/2015 3:21:11 PM};{LED=441 4.4.1 Error encountered while communicating with primary target IP
            address: "Failed to connect. Winsock error code: 10060, Win32 error code: 10060." Attempted failover to
            alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all
            alternate hosts. The last endpoint attempted was 31.193.152.50:25};{FQDN=amiran.org};{IP=31.193.152.50}]

LastError : [{LRT=7/8/2015 3:21:02 PM};{LED=441 4.4.1 Error encountered while communicating with primary target IP
            address: "Failed to connect. Winsock error code: 10060, Win32 error code: 10060." Attempted failover to
            alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all
            alternate hosts. The last endpoint attempted was 194.126.4.70:25};{FQDN=idm.net.lb};{IP=194.126.4.70}]

LastError : [{LRT=7/8/2015 3:20:36 PM};{LED=441 4.4.1 Error encountered while communicating with primary target IP
            address: "Failed to connect. Winsock error code: 10060, Win32 error code: 10060." Attempted failover to
            alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all
            alternate hosts. The last endpoint attempted was
            213.199.154.23:25};{FQDN=cityexpress.ge};{IP=213.199.154.23}]

LastError : [{LRT=7/8/2015 3:20:10 PM};{LED=441 4.4.1 Error encountered while communicating with primary target IP
            address: "Failed to connect. Winsock error code: 10060, Win32 error code: 10060." Attempted failover to
            alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all
            alternate hosts. The last endpoint attempted was
            220.226.202.235:25};{FQDN=aramex.com};{IP=220.226.202.235}]

LastError :

LastError :

LastError :

LastError :

Please provide the output from ipconfig /all on every Exchange Servers and Get-SendConnector | FL. seems  second DNS entry is incorrect.

here is IPCONFIG /ALL

Windows IP Configuration

   Host Name . . . . . . . . . . . . : E15
   Primary Dns Suffix  . . . . . . . : potifreezone.corp
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : potifreezone.corp

Ethernet adapter Ethernet:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft Hyper-V Network Adapter
   Physical Address. . . . . . . . . : 00-15-5D-14-33-12
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.20.135(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.20.1
   DNS Servers . . . . . . . . . . . : 192.168.20.10
                                       192.168.20.11
   NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{2C31BB5E-FA54-4F7B-917F-FFCFF5283B56}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

we have single Exchange server, here is Send connector:

AddressSpaces                : {SMTP:*;1}
AuthenticationCredential     :
CloudServicesMailEnabled     : False
Comment                      :
ConnectedDomains             : {}
ConnectionInactivityTimeOut  : 00:10:00
DNSRoutingEnabled            : True
DomainSecureEnabled          : False
Enabled                      : True
ErrorPolicies                : Default
ForceHELO                    : False
Fqdn                         :
FrontendProxyEnabled         : False
HomeMTA                      : Microsoft MTA
HomeMtaServerId              : E15
Identity                     : ToInternet
IgnoreSTARTTLS               : False
IsScopedConnector            : False
IsSmtpConnector              : True
MaxMessageSize               : 35 MB (36,700,160 bytes)
Name                         : ToInternet
Port                         : 25
ProtocolLoggingLevel         : None
RequireOorg                  : False
RequireTLS                   : False
SmartHostAuthMechanism       : None
SmartHosts                   : {}
SmartHostsString             :
SmtpMaxMessagesPerConnection : 20
SourceIPAddress              : 0.0.0.0
SourceRoutingGroup           : Exchange Routing Group (DWBGZMFD01QNBJR)
SourceTransportServers       : {E15}
TlsAuthLevel                 :
TlsCertificateName           :
TlsDomain                    :
UseExternalDNSServersEnabled : True

Have you made any recent changes on your servers, any?

Regards

Vickram M

after it stopped working i changed connector to use external dns servers but no result!

Get-SendConnector | Set-SendConnector -ProtocolLoggingLevel Verbose

Run this command and collect the logs from "C:\Program Files\Microsoft\ExchangeServer\V15\TransportRoles\Logs\Hub\ProtocolLog\SmtpSend"

It looks it is not a DNS issue. It looks that it gets MX results, but it is unable to connect remote servers. Would you try to run telnet 220.226.202.235 25 (last SMTP server for domain aramex.com).

If you do not get any SMTP response, contact your network admin.

Connecting To 220.226.202.235...Could not open connection to the host, on port 25: Connect failed

it means it`s network issue?

It means, that port 25 is blocked on firewall (windows or hardware). Ask your network admin. It should work fine after he opens communication to remote servers on port 25.

Please check following article with your network admin: https://technet.microsoft.com/library/bb331973(v=exchg.150).aspx

Thanks Guys, it was ISP problem, they have blocked 25 port! Thanks all for HELP!

• Edited by Daniel Arutinov 18 hours 10 minutes ago