I have problem sending emails, i checked the email sending error logs, and I found this:
RCPT RCPT TO:
503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.
And this:
Sending unsolicited commercial or bulk e-mail to Microsoft's computer network is prohibited. Other restrictions are found at http://privacy.msn.com/Anti-spam/. Violations will result in use of equipment located in California and other states.
And following I dont understand what it means:
DATA DATA 354+Start+mail+input;+end+with+.
RCPT RCPT TO: 250 Requested mail action okay, completed
and some others...
This SMTP server requires authentication. Depending on your provider, you either need to specify username/password or, if your host uses POP-before-SMTP auth, you need to check your email first and that action adds you to an authenticated list for some time so you can send replies.
This error means you need to authenticate against your SMTP server before sending out emails.
Related
I want to send an email to a mailbox on Gmail's servers. But I cannot understand why Google wants to authenticate me, the sender.
I want to act as the sending mail server. So using openssl, I open a TCP connection to smpt.gmail.com. Openssl takes care of the TLS handshake, and I am ready to send a message of the SMTP protocol
openssl s_client -connect smtp.gmail.com:587 -star
ttls smtp
CONNECTED(00000005)
.. Lots of TLS or SSL details ...
---
250 SMTPUTF8
I send the HELO message:
HELO smtp.gmail.com
250-smtp.gmail.com at your service
And I try to send a message:
MAIL FROM: <me#nowhere.com>
530-5.7.0 Authentication Required. Learn more at ...
But Gmail servers responds that I need to be authenticated.
I would understand authenticating with the mail server if I were reading from a mailbox, but I don't get why I need to authenticate to send a message to a mailbox.
I can't find much documentation on the internet regarding this either.
Is there some kind of mechanism where every owner of a mailserver on the planet needs to create a google account just to send emails to a gmail mailbox?
How does the mail servers at Microsoft outlook send messages to Gmail servers?
What am I missing here?
Modern SMTP splits message submission into a separate transaction, distinct from message transport. You are generally required to authenticate with your local MTA (Gmail's if you are sending from Gmail, Outlook if that's where you are sending from, etc) to submit a message, and then the transport network of SMTP proper takes it from there.
There used to be a time when you were able to submit a message to a remote MTA by something called direct injection, but spammers abused this (along with pretty much every other feature of email) to the point where this model was no longer sustainable.
The modern message submission protocol runs on port 587, and generally requires authentication, and thus can obviously only accept submissions from local users for whom the server has identity and authentication information.
The transport protocol, by contrast, runs on the original port number, 25, which is more or less universally firewalled now for residential IP addresses. (Inside an organization, you might still be able to connect to a local mail server on port 25 and perhaps even submit messages without authenticating.)
In addition, regular mail servers on the modern Internet need to maintain a positive reputation. This helps keep the bad apples somewhat isolated, but raises the bar for newcomers and minor independent operators. See e.g. SenderBase for one such reputation system, though the big operators typically have their own proprietary ones which are not available to outsiders.
How do these online services of spoof email work?
They usually require the from domain really exists. It means there is a smtp server which accepts the connection.
Let's say I send a mail from test#xxx.com. The site will try to connect to the xxx.com smtp server and it will deliver the message.
The questions are:
How it is able to find the xxx.com domain smtp server?
To correctly deliver the message, xxx.com has to be without authentication. However, also with a fake gmail.com domain, the email is correctly sent, even though Gmail requires auth.
Can someone help me out to this below issue. We done change smtp to office365 but after change the smtp host, we start getting below issue
Transaction failed. The server response was: 5.2.0 STOREDRV.Submission.Exception:SendAsDeniedException.MapiExceptionSendAsDenied; Failed to process message due to a permanent exception with message Cannot submit message.
The email address used in the SMTP protocol (MAIL From:<salesperson1#contoso.com>) must be identical to your office365 account name, i.e. "salesperson1#contoso.com".
Source: check this Microsoft support page, related to printers and scanners:
"Your printer or application must send email from the same address that you entered logon credentials for during email setup. If the printer or application tries to send email from a different account, this results in an error similar to:
5.7.60 SMTP; Client does not have permissions to send as this sender.
For example, if you entered login credentials for sales#contoso.com in your application settings, but the application tries to send emails from salesperson1#contoso.com, this is not supported. For this scenario, use Microsoft 365 or Office 365 SMTP relay instead."
In our case, the address mismatch causes office365.com to reply with the following error message:
554 5.2.0 STOREDRV.Submission.Exception:SendAsDeniedException.MapiExceptionSendAsDenied; Failed to process message due to a permanent exception with message Cannot submit message.
and has been resolved as described.
If using Asp.net/c#, then ensure the sender id used in NetworkCredential is similar to the from email address as below:
MailServer.Credentials = new System.Net.NetworkCredential(SenderId, SenderPass);
MailAddress from = new MailAddress(SenderId);
I have installed email router server on production server where Dynamics crm has been installed but when try to reply any mail, the result shows pending send and an error shows in event viewer. I am trying to send mail using a SMTP Relay server. Although, the same application with in same domain and same settings on testing server is working fine.
The event viewer error log is as given below.
Description:
61042 - An error occurred while processing the outgoing email message with subject "RE: test " for SMTP: http://172.26.4.123/TESTCRM for
delivery through 172.26.4.124.
System.Security.Authentication.AuthenticationException: The remote
certificate is invalid according to the validation procedure.
Please suggest some solutions.
Welcome to StackOverFlow.
Hope you are doing well. Let try some steps to troubleshooting the issue:
Set the E-mail Router Outgoing profile to Anonymous.
a. Launch the Microsoft Dynamics CRM 2011 E-mail Router.
b. Open the Outgoing SMTP profile.
c. In the Authentication Type drop down, choose Anonymous.
d. Click Publish.
Updated the settings for the outgoing profile of the email router to use SSL and matched the name of the SMTP server with the name of the certificate. In this case, the proper name was the FQDN of the Exchange server.
** SSL for SMTP is not supported in Ex2010, so if this is your escenario then: unchecked “SSL” for SMTP, saved CRM router settings.
Please find below articles regarding your issue.
https://support.microsoft.com/en-us/help/954584/error-message-when-you-try-to-test-access-from-the-microsoft-dynamics
https://community.dynamics.com/crm/f/117/t/99471
https://community.dynamics.com/crm/f/117/t/231301
Dynamics CRM Email Router Troubleshooting 101 – Outgoing Emails
I have just installed VestaCP on a fresh CentOS VPS.
I have set up email for one domain. All mail sent to that domain bounces with the error 550 smtp auth requried
I have commented out the following;
deny message = smtp auth requried
from exim.conf
I have turned off anti-spam.
I still get the bounce with this message.
Specifically, if I send an email from a gmail account google responds:
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain foobar.tld by mail.foobar.tld. [x.x.x.x].
The error that the other server returned was:
550 smtp auth requried
Any experience with this? I have seen the problem on a number of threads but have not found a solution.
I partially solved the problem. It only occurred when sending mail to the smtp server from a domain that was hosted on the same server for web but not for email. When I sent email from a domain that had nothing to do with any domains hosted on the same server as the exim instance, then it got through. I still can't send email from the domain that was causing the problem and I would like to, but I can work around it.
So to be clear in case anyone reads this:
domain1 web is hosted on server1
domain1 email is hosted on google's servers
domain2 is hosted on server1 for web and email
exim is running on server1
when I send email from thunderbird via google's server from email#domain1 to and email#domain2 the exim instance asks google's smtp server for authentication even though the mail is being delivered to a mailbox in its list of domains it can deliver to on the same physical server where it is running.
I suspect that it is suspicious of the from address, which it shouldn't be since the mx records indicate that it does not host mail for that domain.