What would cause this issue receiving email from a host?




Log Name: Application
Source: MSExchangeTransport
Date: 07/12/2020 06:10:51
Event ID: 1035
Task Category: SmtpReceive
Level: Warning
Keywords: Classic
User: N/A
Computer: srv-EX1.srvo.local
Description:
Inbound authentication failed with error LogonDenied for Receive connector Client srv-EX1. The authentication mechanism is Login. The source IP address of the client who tried to authenticate to Microsoft Exchange is [x.x.x.x].
Event Xml:



1035
3
1
0x80000000000000

1145792
Application
srv-EX1.srvo.local



LogonDenied
Client srv-EX1
Login
186.216.69.50



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You need to make a connector with permissions for relay to that IP address to enable the relay.

We usually make a separate SMTP server on IIS if there's a server or IP address handy or you could use a custom port or socket to relay the message.

You could also find out if your ISP supplies an SMTP server and tell the other device to use that.

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