Hey Igor,
Look in your joomla backend under system -> system information. Is safe_mode off on your server? It should be set to off, so if it isn't talk to your admin about it.
Regards,
Daniel

Hmm..
Yes, Safe Mode is OFF

Hey Igor,
Since I see that the extension seems to work, can you go in:
/libraries/cmandrill/query/query.php
ON line 137 you have:

curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

remove this line and check if the extension is still working after that.

Thanks,
Daniel

I commented this line
[code type=php]// curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);[/code]
and all warnings disappeared and extension still works! Thank's!
And what to do with the second problem? After sending a letter from my site I keep getting this warning


May be the problem is in Mandrill and not in your extension?

When we created the cmandrill extension mandrill didn't have support for emails that had cc . That is why we are sending through phpmailer. You should actually not see this warning as it should go into the error log and it should not be shown to the user.

Set error reporting in your global config to none and make sure that debug is also turned off.

Currently mandrill is supporting mails with CC and we should address this in the next update.
Regards,
Daniel

Thank you for detailed answer! I am looking forward for the next update of your useful extension!
Regards,
Igor