Sending Emails Is Not Possible

In this article, we'll go over possible reasons that you may not be able to send emails and some common solutions.

In most cases, you should be able to find the error quickly and correct it yourself.


If You Receive an Error/Bounce Email (Mail Delivery Notification)

In this case, the settings for your email address are correct. The email was sent but rejected by the recipient. The causes can be narrowed down using the details from the bounce email.


Make sure of the following:

  • The recipient's address is spelled correctly.
  • The destination address still exists. If it does not, try to reach the recipient in another way to double check.
  • The recipient's mailbox is not full.
  • Your email is rejected by the recipient's email server. For example, companies often block emails that do not originate from their own employees. Ask the recipient or their email administrator.
  • There is a problem on the recipient's side. Simply try again later.
If You Receive an Error Message from Your Email Program

Read the details of the error message and look in the help section of your email program or on the manufacturer's website. You will often find troubleshooting tips there.


Try the following steps if the program help does not offer you a solution.

  • Security software (such as a firewall or anti-virus) interferes with or blocks the email transmission. Deactivate them for testing purposes.
  • Check your email settings.
  • Avoid using SMTP port 25. Instead, try the recommended port 587.
  • Make sure that a check mark is set in your email program for Server requires authentication and that your complete email address (ex: is entered as the user name.
  • Make sure that the encrypted email transmission is activated. If not, please do so. Make sure you have the correct settings for the incoming and outgoing mail servers.
If You Still Cannot Send Email

If none of the above measures helped, please contact our customer service. To make sure that we can help you quickly, please provide
us with the following information:

  • Which email address is affected?
  • Do you receive an error message and if so, which one?
  • Since when has the error been occurring?
  • Which email program do you use to manage your emails?
  • If you use Webmail, which browser do you use?
  • Which operating system do you use?
  • Does this problem occur on other devices, such as computers, smartphones or tablet computers?