In the customer file, a note may appear at the customer's email address indicating that this address is blocked. This block was not set by you or your team and is also not an opt-out from your messages – it comes automatically from our shipping system.
Why does this warning appear?
We reliably send emails such as appointment confirmations and reminders through our systems. Nevertheless, it can happen that individual emails are not delivered or are rejected by an email provider.
The reason for this is usually not in the actual sending, but in the very strict protection mechanisms of email hosts. These providers fight massive amounts of spam every day – estimates suggest around 160 billion spam emails per day worldwide. To protect their users, they automatically check whether mass-mailed emails have similar content, show suspicious patterns, or meet certain filter rules.
Unfortunately, it can happen that legitimate messages are incorrectly blocked or rejected, even though they were sent by a trusted sender with a good reputation. In email jargon, this is referred to as the sender's reputation – this is generally very good with our mailing. However, a 100% delivery guarantee is technically not possible with emails.
If an email address is repeatedly rejected by a provider or reported as spam, our shipping system automatically sets a block on that address. This prevents further unsuccessful attempts to send to that address and protects the shipping reputation, which also affects delivery to all other customers.
What does "Remove block" do?
By clicking "Remove block", you lift this internal restriction. The email address then receives normal status again, and future messages such as appointment confirmations or reminders will be sent to that address again.
Until now, we could only perform this reactivation internally for you. Now the function is available directly in the customer file, so you can use it yourself without contacting us.
Has the customer opted out themselves?
No. The block has nothing to do with a customer opting out of newsletters or reminders. It occurs purely technically when an email was rejected during sending or classified as spam. A customer's own opt-out would be noted elsewhere in the customer file, not as a block note at the email address.
What can you do?
- Remove the block using the corresponding button in the customer file so the address receives messages normally again.
- Ask the customer to add your messages to their safe senders list. Unfortunately, we cannot provide universal instructions for this, as the procedure differs from email provider to email provider.























