First and foremost, the question of what is or should be used to send e-mails needs to be clarified. Here either a software on a terminal (e.g. Outlook on a PC or AppleMail on a mobile phone) or our WebMail comes into question.
With a software there are usually 2 types of errors, which basically do not really refer to the actual sending, but to the validation process, which takes place before the e-mail is sent:
In this case no connection to our mail server can be established. You should absolutely check the entered address for outgoing e-mail (the so-called SMTP server) and exclude that firewalls or other protection programs block the connection by terminating it at least for a short time.
You should also make sure that the correct port is stored on the outgoing mail server.
SMTP (Port: 587)
SMTP via TLS (Port: 587)
SMTP via SSL (Port: 465)
Some Telekom routers (e.g. Speedport 724 V) block connections to their own SMTP servers. You can solve the problem as follows:
1. Go to http://speedport.ip or open http://192.168.2.1 in your browser.
2. Enter the device password. The device password can be found on the back of the router.
3. Click "Internet" at the top of the horizontal menu.
4. Click on "List of secure e-mail servers" in the menu on the left.
5. Deactivate "Use list of secure e-mail servers" in the middle by removing the check mark.
The changes are saved automatically.
Theoretically, for example, the wrong server may still be entered. However, it is much more likely that the wrong login or password will be used. In this case, you should definitely test the password by logging into the webmail:
https://www.checkdomain.net/en/webmail/
Please also compare in the customer area at https://www.checkdomain.de/login/emails/ whether the login is correct, no dialing tone has slipped in somewhere and whether the login of another mail address is not used accidentally.
Instructions on how to set up various software to compare the settings can be found under the following link:
https://www.checkdomain.net/en/support/faq/emails/
If you send e-mails and an error message, a so-called mailer daemon, is returned, please send it to us together with your customer data to support@checkdomain.de. for verification. We will then have to check this more closely and inform you as soon as possible.
In webmail there should only be other problems in a few exceptional cases. Please describe them to us as exactly as possible with screenshots:
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