This message tells you that the other side's server does not accept emails for the specified domain (example.com). In most cases, this is just a typo in the domain. Therefore, check the email address and resend the message.
Mail delivery failed: returning message to sender
You will receive this type of email from the sender "Mailer-Daemon@SYSTEM.streampanel.net". Where "SYSTEM" is the name of the system on which your web hosting package resides. This message was created automatically by mail delivery software.A message that you sent could not be delivered to one or more of itsrecipients. This is a permanent error. The following address(es) failed: Excerpt of the email Reason for ...
My email delivery has been restricted / limited
In some cases, we have to take manual measures and limit the e-mail dispatch for your web hosting account accordingly. In order to be able to remove such a limitation again, you must fulfil all required measures. You will receive the list of content to be fixed from us via the support system without request. Please note that only because of the security measures you will be given a path to the causing script ...
all hosts for 'domain.tld' have been failing for a long time (and retry time not reached)
Error I get the following error message when sending emails through the web hosting systems: Solution Write to us via support ticket with the full error message. You cannot solve the cause on your own.
SMTP ports outgoing (25 , 465, 587)
Customers with external mail servers should note the following circumstances. Sending via port 25 is disabled for internal and external use on all systems. (Regardless of the display of the cPanel interface) If you need to access external mail servers, the secure ports 587 465 are available. If you are using a mail provider that requires you to use port ...