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https://stackoverflow.com/questions/1491915/unable-to-send-emails-to-external-domain-using-smtp
If you were to look up the MX record for the destination address (in your example, it is asdf.com) and then use that for the host property of SmtpClient, it should accept the message for delivery without authentication since it's to a local user. This is not easy to do since System.Net doesn't provide a managed DNS class that can return MX records but you can P/invoke unmanaged code to do it.
https://docs.microsoft.com/en-us/dotnet/framework/configure-apps/file-schema/network/smtp-element-network-settings
<smtp> Element (Network Settings) 03/30/2017; 2 minutes to read +9; In this article. Configures the delivery format, delivery method, and from address for sending emails.
https://social.msdn.microsoft.com/Forums/en-US/a715e244-931c-4f8d-bbbe-345ad6eb1c52/571-unable-to-relay-for-email-address
Jan 20, 2012 · I just want to know if this is something that needs to be changed on the SMTP server or is there some setting that I can set from my program that will allow this relay.
https://stackoverflow.com/questions/11719534/smtpclient-sending-without-authentication
SmtpClient sending without authentication. Ask Question Asked 7 years, 3 months ago. ... But I am unable to send it. For sending it using C# I am using the following code: ... Hot Network Questions 60’s or earlier short fiction about an object that encompasses the world, and a woman’s name repeated
https://stackoverflow.com/questions/21461927/5-7-1-unable-to-relay-is-this-the-web-server-or-the-exchange-server
ok i reset the credentials, i guess these were causing errors! whoops! now i get {"The SMTP server requires a secure connection or the client was not authenticated.
https://www.stellarinfo.com/article/exchange-smtp-error-550-unable-to-relay.php
Jul 03, 2019 · Steps to resolve error Exchange SMTP Error 550 5.7.1 Unable To Relay by using manual as well as automated methods.
https://www.experts-exchange.com/questions/28257332/Sending-SMTP-relay-email-with-VB-net.html
Find answers to Sending SMTP relay email with VB.net from the expert community at Experts Exchange
https://www.codeproject.com/Questions/1243857/EXCEPTION-SMTP-unable-to-relay-recipient-in-non-ac
You need to contact whoever administers the smtp server you are using ("server30.company.local") and tell them you want to relay from the company.com domain and follow their advice. They might flat out say you can't, they might be able to configure their server to allow this, they might give you a special set of credentials you can use.
https://practical365.com/exchange-server/exchange-2013-configure-smtp-relay-connector/
Oct 08, 2013 · How to Configure a Relay Connector in Exchange Server 2013 October 8, 2013 by Paul Cunningham 318 Comments A very common scenario for Exchange Server 2013 administrators is the need to allow applications and devices on the network to use the Exchange server as an SMTP service.
https://www.godaddy.com/community/Managing-Email/Cannot-send-from-Godaddy-Email-from-C-ASPX-web-app/td-p/69593
Solved: I am trying to send emails from a Godaddy email account [email protected] from a C# ASPX Web application project using the following
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