Sending Emails Is Not Possible

Problems with sending email can have many causes. With the help of this article, you should be able to narrow down and solve the problem.

Please Note

Starting on August 31, 2020, a country-specific outgoing mail server (SMTP server) must be used when using an IONOS mail server. Without the correct server (smtp.ionos.com), no emails will be able to be sent. For further information, please refer to the article Changing SMTP Servers for Outgoing Email via IONOS Mail Server.

Please Note

Do you have problems receiving emails? The article Receiving Emails Not Possible will help you to solve the problem.

IONOS Login and Server Data for POP3/IMAP Unknown

The IONOS login and server data for POP3 or IMAP are not known to you.

You can use your IONOS email address with any email program, such as Microsoft Outlook or Mozilla Thunderbird, on your computer or smartphone. The necessary settings, e.g. server address or port, are summarised in the article Settings for your email program (IMAP & POP3).

Undeliverability (Bounce) Message on Email as IONOS Customer

You are an IONOS customer. After sending an email using your IONOS email address, you received a bounce message.

If one of your emails cannot be delivered, you will receive an email with a status code. This status code informs you about the reasons for the undeliverability. The article Error messages for undeliverable emails lists the status codes and provides you with possible solutions.

Undeliverability (Bounce) Message on Email as a Non-IONOS Customer

You have your email account with an alternative email provider. After sending an email to an IONOS email address, you received a bounce message.

If an email you send to an IONOS customer cannot be delivered, you will receive an email with a status code. This status code informs you about the reasons for the undeliverability. The article SMTP error messages of the IONOS mail servers lists the status codes and provides you with possible solutions.

Error Message from Email Program on Computer or Smartphone

When you send an email through the email program on your computer or smartphone, you receive an error message from the program.

Use the IONOS configuration guides to check the settings of your email program. Instructions can be found in the Help Centre under the drop-down list boxes on the Email > My Email overview page:

  • Microsoft Outlook
  • Using email on Android smartphones
  • Using email on Apple iPhone/iPad
  • Other email programs

If errors occur despite correct setup of the email program, please read the background information in the program help of your email program or on the manufacturer's website.

Email Transmission Successful - No Delivery

Your email was sent successfully and without an error message. However, the email is not delivered to the recipient.

In this case, the problem does not necessarily have to be on your side. Notify the recipient of the email about the Help Centre article Receiving email not possible. Suggest a check based on the solutions presented to rule out a problem on the recipient side.

Check whether security software on your computer or smartphone, such as a firewall or virus scanner, is interfering with or blocking the sending of email. Issue the appropriate approvals for sending emails. You can find details on this in the program help or on the manufacturer's website.

PHP Mailer Setup

Sending email via PHP Mailer, e.g. in Wordpress, does not work.

PHP Mailer is a code library that is used by many PHP applications to send emails via SMTP. Configuration details for PHP Mailer can be found on the project page on Github. The IONOS SMTP parameters can be found here.

Problem Not Described

Your problem was not described so far and still exists.

Check the IONOS status page to see if there is a wider malfunction.

Is there no wider malfunction and the solutions mentioned so far have not helped?

Give us a call