1.219.1
Security10 October 2026Security release. Update promptly.
Mail sent from phones and desktop mail apps now goes through the same sending limits as every other message, so one stolen mailbox password can no longer be used to send unlimited spam from your mail server.
Fixed
- Each message is counted once, whichever port it arrives on. A message passes through exactly one sending check, so limits mean what they say.
Security
- Mail apps on ports 587 and 465 are now rate-limited, cut off automatically and held to warm-up caps. The limits that already applied to port 25 and to webmail now apply to every authenticated mail client. A mailbox that suddenly sends far more than usual is deferred and then stopped, exactly as on the other ports.
- Sending is charged to the mailbox that signed in, not to the address the client typed. A client can put any sender address, or an empty one, on a message. Mail is now counted against the signed-in mailbox's domain, so an empty sender can no longer slip past the limit. When a domain is cut off, the event names the mailbox whose password should be changed.
Upgrading
Nothing to do. Mail nodes apply the change on their first cycle after their agent updates. Limits are set per mail domain, so a mailbox that trips its domain's cut-off stops that domain's outgoing mail until sending is resumed from the mail domain's page.
Why
Your mail server's sending reputation is shared by every customer on it. Until this release, mail sent through the submission ports that phones, Outlook and Thunderbird use was not rate-limited, could not be cut off automatically, and ignored the IP warm-up caps. That meant one phished password could put your sending addresses on blocklists.

