Recently, some of our readers reported that they encountered an smtp command causing a mail error.
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There’s a lot going on in this case. Let’s break them down:
4.7.1 [TS03] All xxx messages from .xxx.xxx.xxx are deferred without desensitization;
Please note that this is Yahoo! and ymail – you’re on your own crappy list. Maybe you spammed another one there; Maybe someone who had this IP address before you spammed it, maybe your reverse DNS will show this IP address in a PPPOE working relationship and block it due to the high level of spam. However, your mail server is not at fault; nothing to see here.
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The smtp command that caused the error is still "HELO". Response from this remote server '504: 5.5.2 : Helo command rejected: Fully qualified hostname required This is pretty obvious: your mail server doesn’t have a FQDN. This mail server asks you to specify under whom you can be found when you send him an email. probably so they can run some incredible reverse DNS or something to match what your organization says with what you send.
Failed to send message to host "207.115.11.16" when delivered to the remote "bellsouth domain.net" for the following reason: An SMTP protocol error has occurred.Message delivery to "68 host.87.26.147" failed, and delivery failed for the remote domain "comcast.net" due to the following reason: An SMTP method error occurred.These are the ones you really need to focus on. I can parse your Capture Wireshark/Pcap and corporate email traffic and then come in and see what’s going on with you. If necessary, you can rebuild via telnet, this will give you a better idea of what errors are occurring. Maybe this is your situation, maybe not.
Hello company, I’m facing a problem that causes me a lot of complications. We systematically send an electronic invoice, ERP processes it and sends it to SMTP (Windows Server 2012 R2), which sends it to the client.
Some work, unfortunately other clients see the mail server reject the connection. I have to fix this because sending unconfirmed invoices (one country of them) one after another is a nightmare.
I seem to be facing a few dilemmas, Oh, by far the most common:
Message to delivery number ‘46.105.158.212’ when delivered to remote domain ‘thedomain.net’ failed for the following reason: The remote SMTP AUTH service failed to negotiate. Shipping
The message “185.166.213.99” could not be delivered to the remote domain “thedomain.com” for the following reason: The remote SMTP service does not always support TLS.
“The SMTP action that generated the error message is almost certainly ‘STARTTLS “. Controller server response: ‘250-eufrates.serverforisp.net Hello 81-46-202-57.mydomain.net [81.46.202.57] (probably wrong), pl’.
* I’m changing the location and IP addresses to random for security reasons.
Message delivery to host ‘178.32.1.145’ failed when delivered to the remote end of internet domain ‘thedomain.com’ due to the following reason: The remote SMTP service refused the SSL handshake because the certificate was terminated.
systouny wrote:
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The message needs to be delivered to this particular host ‘46.105.158.212’ but delivery to the remote domain ‘thedomain.net’ failed for the following reason: RemoteSMTP Happiness AUTH refused to negotiate.
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This could mean that the receiving server is unwilling or unwilling to authenticate you, and you also have outgoing settings that allow credentials to be used. Typically, server credentials are not required unless you are creating a smart host relay for reply email, and they should not be effective when sent directly to recipients.
systouny wrote:
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The mail delivery service to host ‘178.32.1.145’ failed to deliver mail to the remote region ‘thedomain.com’ for the following reason: The remote SMTP service rejected the SSL handshake because the certificate was closed.< br>
.. .Your SSL certificate on your server has also expired, so the receiving server usually doesn’t trust it for validation or just encryption. Renew your SSL certificate.
systouny wrote:
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Mail delivery to various types ‘185.166.213.99’ failed when delivered to the remote domain ‘thedomain.com’ due to the following reason: The remote SMTP service does not support TLS.
SMTP – Verb normallycauses the error is “STARTTLS”. Response from remote internet: “250-eufrates.serverforisp.net hello 81-46-202-57.mydomain.net [81.46.202.57] (might be fake) please.”
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They enforce encrypted email for transmission, and the receiving server never supports it. You don’t need to use TLS to send them, switching to opportunistic TLS, provided you’re not legally required to use transport encryption. Assuming it’s possible, TLS encrypts traffic where possible, and for those that do, the position that receives the encrypted traffic sends some unencrypted email.
Final thought: Use a smarthost relay from your 2012 or Office 354 server or sending server/host, for this you can apply TLS file encryption and authentication, ideally set up multiple connectors if you have that to authenticate with the mail server client . .
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