Service Alert: Zimbra Server Upgrades

Starting on Mon 13th Feb, we will begin a series of Operating System upgrades to our Zimbra servers to onto the latest version of Linux in preparation for upgrading Zimbra to the latest version (8.7.1), the upgrades for which will follow a couple of weeks later.

This will, unfortunately, involve some downtime for each server and is not without its risks.

We anticipate that each server will be down for a period of up to 2 hours, but hoping to keep it to 30 minutes.

The planned schedule is as follows: Mon 13th 22:00 – zimbra004 Wed 15th 22:00 – zimbra003 Thu 16th 22:00 – zimbra002 As part of this work, we will be removing support for some weak or obsolete SSL ciphers to improve security levels.

This could affect some users still running old web browsers.

Please accept our apologies for any inconvenience caused by this.

Old MessageBunker is dead, long live the new one!


Following on from our announcement at the end of September regarding the new MessageBunker interface and initial running of old and new versions in parallel, we can announce that, as of today, the old site has now gone – to be completely replaced by the new one.

Take a look at

Service Alert: Anti-Virus False Positives

We have been made aware that several users of our anti-virus email filtering are receiving what appear to be false-positive notifications as of this morning. These are affecting emails with attached .doc (and possibly other MS Office) files. The email in question is blocked and the sender/recipient (if hosted by us) will receive a notification stating a line similar to: /tmp/24007: Win.Exploit.CVE_2016_3316-1 FOUND. We are investigating this as a matter of priority. Although disabling your anti-virus will allow such emails to get through, we do not recommend doing this unless it is a very urgent matter. Services such as wetransfer and Dropbox may be used instead until we have resolved this situation.

UPDATE: We have now modified our virus signature databases to remove this false-positive detection. Apologies for any inconvenience caused. If you have advised a user to disable anti-virus we strongly recommend you reserve this as soon as possible.

Service Alert: Stats Update

We’ll be doing an update to the stats database this afternoon. This process will take around 30 minutes, during which time some stats might look a bit wonky. After the work is completed, stats should be quicker to display, particularly at the VISP level.

Service Alert: Issue with Control Panel Quarantined Email Viewing

We have an issue with this, which we are currently investigating. While we fix this, there are other ways to view the Quarantined email – simplest is to use Webmail to view the Spam folder.

EDIT: Now resolved. Quarantine folders can now be viewed as normal in the Control Panel. This was a minor code issue due to a service update yesterday. Apologies for any inconvenience.

Service Alert: Mail SSD Backend Announcement

We’re pleased to announce that following months of behind-the-scenes work, all Mailcore and wholesale email mailboxes are now stored on SSD, using the most advanced filesystem in the world, ZFS. This gives us numerous advantages, including faster performance, improved reliability and less energy consumption. ZFS gives us instant snapshots and guarantees against filesystem corruption as well as adding even more performance due to its advanced memory caching scheme.

Service Alert: Notification of SQL Works

On Thursday 28th July, starting at approx 10pm, we will begin the final stage of a central database server upgrade. We will be upgrading our MySQL servers from v 5.1 to v 5.6, and switching from MyISAM database format to InnoDB. This will give us some speed and reliability advantages. We’ve found a way of doing this with minimal disruption (expecting 2 sub-10 second outages, if that), but this is a core part of our system, and so there is a risk of more significant problems if things don’t go according to plan, along with the possibility of some minor issues elsewhere due to the change in database format.

Service Alert: Notification of upgrade for CalDAV users

On the evening of Thursday 26th May we will be upgrading all our MailCore Pro CalDAV servers to a new version. This includes several enhancements for those using our services with calendaring apps including improved invitation support and CalDAV-compliant calendar sharing that can be administered from with apps (subject to support). Performance is also greatly improved. No action is required on your part or your customers to receive these updates and we do not anticipate any downtime. A further advisory will be sent when the upgrade is completed.

New Log Searching Feature for Partners

We’ve introduced a new feature to the Partner Control Panel: Search Logs. If your customer thinks they may be missing an email, you can quickly search their entire inbound email history to see exactly when a given mail arrived and how it was processed. All you need is the customer’s email address and a rough date range. You’ll see what we received and how we processed it (e.g. into the user’s inbox, SMTP forwarded or marked as spam).

We hope this new feature will assist in quickly diagnosing common issues such as where an email has got to and help improve service to your customers.

A link to the ‘Search Logs’ page can be found on the main Partner Portal Account Management screen.

Any feedback on the service would be welcomed.

Service Alert: Anti-Virus Extreme Setting – Macros

We have just enabled a new feature for those using Extreme setting on Anti-Virus. This blocks all Word/Excel attachments that contain macros of any sort, reporting them as: Heuristics.OLE2.ContainsMacros

As this is the Extreme setting, we thought it appropriate to enable this feature. As ever, we welcome your feedback on the impact of this.