This guide details the reasons why sending a Newsletter via Infomaniak may be blocked, as well as best practices to prevent these blockages in the future.

Common causes of Newsletter blocking

The sending of a Newsletter can be interrupted in the following cases:

• an excessive number of recipient email addresses are invalid or non-existent, resulting in a high bounce rate.
• a high rate of spam complaints from recipients.

As an email host and newsletter sending service provider, Infomaniak is required to implement strict mechanisms to combat spam.

Indeed, if Infomaniak's IP addresses or domains are listed on blacklists, this would compromise the deliverability of all emails sent by its clients, including those that are compliant, and would harm the service's overall reputation.

Preventing blockages when sending a Newsletter

To do this:

• Use only contact lists obtained with explicit consent.
• Prioritize building your lists using double opt-in forms, ensuring active validation of subscribers.
• Clean your contact lists regularly—at least once a year—using specialized services such as NeverBounce, Bounceless, Verifalia or QuickEmailVerification, to remove invalid or inactive addresses.
• Ensure that your emails clearly display your brand or your company's name, thereby building trust with recipients and ensuring transparency in your communications.
• Avoid importing lists from other hosts without first performing a thorough cleanup of these contacts.
• Check your campaign targeting carefully to ensure that only relevant and consenting subscribers receive the Newsletter.

What to do in case of a sending block?

In case of a blockage, contact Infomaniak support quickly to diagnose the cause and get assistance to complete the blocked send.