CakeEmail SMTP syntax error 555 (#5.5.4) while sending e-mail to multiple users (with the use of bcc array)

Hello.

I have following problem: I use Smpt method to deliver e-mails from website.

E-mails which are sent to just one recipient (for example: message with registration confirmation, message with new password, etc.) work just fine.

The problem is when it comes to send message to multiple recipients, while sending a newsletter.

When I try to send newsletter to let's say 2 e-mail addresses - it all works fine. But when I try to send it to all users (about 200 of them), there is a following error:

SMTP Error: 555 syntax error (#5.5.4)

Error: An Internal Error Has Occurred.

Stack Trace

#0 /home/users/opg/public_html/lib/Cake/Network/Email/SmtpTransport.php(156): SmtpTransport->_smtpSend('RCPT TO:_sendRcpt()  #2 /home/users/opg/public_html/lib/Cake/Network/Email/CakeEmail.php(967): SmtpTransport->send(Object(CakeEmail))

...

What could be the cause of this? I cannot find any information in the web. Could it be something wrong with the mail server?
I checked e-mail addresses, to which the newsletter was going to be sent - and they all seem correct.

Thank you in advance

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