Sending Email Not Working For Different Domains

Hi Team,

We migrated our mailbox to new host provider (everleap) now. Accordingly we updated the settings in the admin panel (Email configuration). Now the email functionality is not working as expected.

Mails are sent only if the domain name is same as mydomain.com. Example: '[email protected]'
Mails are failing if the domain is not mydomain.com Ex: '[email protected]'
Gives the error: Mailbox unavailable. The server response was: Authentication is required for relay

Note:
Email: [email protected]
Display name: myemail
host: mail.mydomain.com
Port: 25
User: [email protected]
Password: is entered correctly.
SSL: Unchecked
Default Credentials: Unchecked

Note:
1. Logs indicate no records of failure. So can't find more information whats causing the failure.
2. Message queue doesn't show any records, not even for the successfully sent test emails for my own domain email accounts EX: [email protected], but my inbox receives the mail properly.


Can someone please guide.

"Authentication required" usually indicates that the mail server is requiring additional credentials in order to "relay" the message. You may just need to add your own domain to a list of acceptable domains to relay for in your mail server account settings at everleap...or maybe you just need to enable "Relaying" altogether.

Hi Everyone,
            I am also having similar kind of issue.The credentials we using are  E-mail address= [email protected], Host Name= asmtp.setelco.com.sg, Port= 25.Problem is, if we are sending email from [email protected] to [email protected](Same Domain) it is working fine, but when i am sending email from [email protected] to [email protected] or [email protected](Different Domain) etc etc...this mail is not going.It is showing in message queue but still not send.Even if i press RUN NOW in schedule tasks(send emails)the email is still not going.
The Error i am getting in log is as follows:
System.Net.Mail.SmtpException: Service not available, closing transmission channel. The server response was: 4.0.0 Tarpitting active for [137.116.155.35] at System.Net.Mail.RecipientCommand.CheckResponse(SmtpStatusCode statusCode, String response) at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, Boolean allowUnicode, SmtpFailedRecipientException& exception) at System.Net.Mail.SmtpClient.Send(MailMessage message) at Nop.Services.Messages.EmailSender.SendEmail(EmailAccount emailAccount, String subject, String body, String fromAddress, String fromName, String toAddress, String toName, String replyTo, String replyToName, IEnumerable`1 bcc, IEnumerable`1 cc, String attachmentFilePath, String attachmentFileName, Int32 attachedDownloadId, IDictionary`2 headers) in d:\Bhashkar\NOP\NoCommerce\Libraries\Nop.Services\Messages\EmailSender.cs:line 137 at Nop.Services.Messages.QueuedMessagesSendTask.Execute() in d:\Bhashkar\NOP\NoCommerce\Libraries\Nop.Services\Messages\QueuedMessagesSendTask.cs:line 43

Can anyone provide the solution or enlighten me about the kind of issue we mite be facing.Thanks in advance.

Regards,
Piyush

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