Thanks. I may well take your advice!

Roundcube is just webmail software that your web host is using, its not a service and doesn't control or have access to your email account.

In addition the error about the account being blocked would have come from the mail server run by your host not from Roundcube.

In conclusion, I think its time to find a new hosting provider.

This is very frustrating, ever since my domain moved to a different (Exact) server (from ChillidogHosting) it has been a string of problems, ChillidogHosting was purchased by ExactHosting a week or so ago. First the web site went down for 2.5 days because the nameservers had been changed in the transition. Then MailChimp could not be authorised because of a propogation of DNS settings issue.

The later issue caused my client to try and use Roundcube to send out emails while the MailChimp issue was being sorted out, After 2 batches of 20 the Roundcube web mail will no longer send emails saying 'Account [email protected] has been blocked from sending due to abusive activity'! It now want me to update the password and (re)-enable 2FA to be unblocked.

When I log into my Chillidog cPanel the email address is no longer there so I cannot access the settings, presumably because it has been transferred to Roundcube? However I have no way to access the RoundCube 'Home' (to go to the admin settings) in order to make these changes. I have not been supplied with appropriate instuctions on where and how to do this? Even if given these instructions with what login details should I use?

I have spent hours on these problems, my client is really fed up because I recommended moving to Chillidog in the first place and I am looking incompetant!

What skin are you using? Elastic does not use the `icon` attribute.

Quick update: we managed to stop the fatal error from appearing in our logs with a small workaround.

In `program/actions/mail/index.php` (around line 740) we wrapped the `asset_url()` call with a `method_exists()` check, so it won't crash if `asset_url()` isn't available in that context:

diff
--- a/program/actions/mail/index.php
+++ b/program/actions/mail/index.php
@@ -737,7 +737,11 @@
-   $inner = html::img(['src' => $rcmail->output->asset_url($attrib['icon'], true), 'alt' => $title]);
+   $inner = html::img(['src' => (method_exists($rcmail->output, 'asset_url') ? $rcmail->output->asset_url($attrib['icon'], true) : ''), 'alt' => $title]);

After applying this, `Call to undefined method rcmail_output_json::asset_url()` no longer shows up in our logs.

We can confirm we're seeing the same fatal errors in our logs as well since updating to the latest 1.7 RC4.

Unfortunately we don't know what exactly triggers it. I haven't been able to reproduce the issue myself so far — it only seems to be triggered somehow by our customers in real usage.

Hi Alec,
thank you, my calendars are now being updated. However, the appointments are not showing up in the Roundcube calendar. I'm getting a database error. Could someone help me with this?

Quote[25-Feb-2026 09:58:23 +0000]: <be2f74e4> PHP Error: Failed to write to kolab cache (POST /?_task=calendar&_action=refresh)
[25-Feb-2026 09:58:23 +0000]: <be2f74e4> DB Error: [7] FEHLER:  ungültige Eingabesyntax für Typ integer: »«
LINE 1: ... FROM "kolab_cache_dav_event" WHERE "folder_id" = '' AND "ch...
                                                             ^ (SQL Query: SELECT * FROM "kolab_cache_dav_event" WHERE "folder_id" = '' AND "changed" >= '2026-02-25 09:57:06' AND "dtstart" <= '2026-03-02 12:00:00' AND "dtend" >= '2026-02-22 12:00:00') in /var/www/html/program/lib/Roundcube/rcube_db.php on line 577 (POST /?_task=calendar&_action=refresh)

Try this in the libkolab plugin config.
$config['kolab_http_request'] = [
    'ssl_verify_peer' => false,
    'ssl_verify_host' => false,
];


That is 100% a phishing email. Roundcube is a open source webmail client there is no centralized "Roundcube Support" and there is no one click upgrades offered through Roundcube branded emails.

I received this email today. Trying to discover if it is real or not:
 

Dear [email protected],
We are closing down all outdated versions of the webmail and our records indicate that your mailbox is on an old version as of Tuesday, February 24, 2026.
To ensure uninterrupted access and avoid any disruption to your mailbox account, please upgrade to the latest version by clicking the button below and signing in.
UPGRADE NOW
Sincerely,
Kita-Bueren Webmail Support

See the attachment.

Thanks for your support.