My mails end up in the spam folder

Hamburg, 07.11.2017

The mails you send end up in the recipient's spam folder? That's annoying, of course - but there are a few things you can do to prevent it.

Basically, the following applies: The sender and his or her mail provider have no direct influence on whether a mail arrives in the recipient's inbox or in the spam folder. Only the recipient (and his or her mail provider) decide this. In order to improve the chances of the mail arriving correctly, a number of preconditions must be met. The provider must take care of some of these.


  1. The mail server through which the mails are sent must be configured correctly. This includes, among other things, that forward and reverse DNS are set and match, that mail name and HELO/EHLO banner match, etc.. This is taken care of by deLink.
  2. The mail server through which the mails are sent must not be on a blacklist. No provider is safe from having its outgoing mail server blacklisted. All it takes is for some user to send a clumsily worded e-mail to a lot of poorly sorted recipients - and it happens. That's why deLink checks all of its mail servers for entries on over 200 blacklists around the clock. If this is the case, we immediately route outgoing mails via other relay servers that are not entered on blacklists.

Users and providers

You as a user should take care of SPF records together with your provider: This is an important point that has become very important in the course of 2017: The entry of an SPF record at the sender's domain. The entry is a simple and free matter that every customer can do themselves at deLink. deLink cannot, however, do this for the customer: If you also send mails via other servers (e.g. via a provider for newsletter dispatch or via your own local mail server), the entry of the standard SPF record would have extremely negative consequences for deLink: Mails that are not sent via the deLink mail system would then almost certainly be regarded as spam!

So here it is up to you, the customer, to enter the correct SPF record. Of course, we are happy to help you with this. If you do not yet have an SPF record for your domain, you should take care of it as soon as possible.

Many large mail providers now automatically classify mails from domains that do not have an SPF record as spam.

You can increase the acceptance of your mails even further if you use DKIM. This is the digital signature of the sent mails. For this purpose

  • generates a key pair for your domain on the mail server
  • the public key from this pair is entered in the DNS

become. If you use the deLink mail system for sending mail and want to use DKIM, please contact support at deLink.


It is your sole responsibility as a user to ensure that you do not send any spam mails or any mails that could be mistaken for spam mails due to their content.