Sender Domain Authentication Agent
In the first week of February 2025, we suddenly saw the queues of a few of our email servers go nuts, slowing down the sending of a handful of our users.
After a quick investigation, we found that a handful of users were getting all of their emails bounced back. These were all soft bounces. A soft bounce is a temporary error and automatically gets retried again later. Meaning we send the email to the servers of the ISPs (exclusive Gmail in this case) and they give us a soft-bounce error and the email goes straight back to our queue to be tried in a few minutes later.
We concluded that the reason for these soft bounces was the senders' DMARC setup. They all had DMARC set up, which was technically valid, but it wasn't 'perfectly' set up.
Gmail had released an update, the next step in their DMARC implementation, which is now much stricter.
As you know, email deliverability is Mailvio's #1 focus. We go out of our way to help users and reduce deliverability stress (as much as possible). In this update, we have added a sender domain authentication agent.
This agent will continuously scan all sender domains from all our users daily to ensure they are 100% correctly set up.
If it detects an issue, it will send you an automatic email (for each domain) explaining precisely what is wrong and how to fix it.
IMPORTANT: To protect the reputation of our IPs and email infrastructure, we will pause your account from sending emails completely if you haven't fixed the issue by day 12 after we detect it.