Maildoso runs its own sending infrastructure for SMTP mailboxes — we act as our own email service provider rather than reselling another company's servers.
What that means for you
We own and operate the sending servers, and we use an intelligent, dynamic IP-rotation system — your mail goes out across a pool of IPs that changes over time rather than a single fixed IP.
Because we control the infrastructure directly, we can maintain strong, consistent deliverability and manage all the DNS (MX, SPF, DKIM, DMARC) for your domains ourselves.- Domains cannot be manually reassigned to specific outbound IP pools as the dynamic rotation system automatically handles IP assignments.- Reverse DNS (rDNS) or PTR records on sending IPs may appear missing or generic because of the frequent IP changes. This is expected behavior and does not indicate a misconfiguration.
One practical result of IP rotation: if a third-party tool flags "one of your IPs," it's usually looking at an IP you've already rotated away from, not your live sending. See One of my sending IPs shows as blacklisted. Rotation also affects which of your domains a recipient sees — see Why does the recipient see a different sender or domain? (mailbox rotation). For how DNS is handled, see How DNS records work for your Maildoso domains. Maildoso does not handle delisting requests for blacklisted IPs because the dynamic rotation system ensures that affected IPs are already rotated away from active use.