SMTP error

I am trying to send emails using SMTP but I am having this error:

Unable to email via mail.profebox.com

Validation failed for: =?UTF-8?Q?"Bugs=20PROFEBOX=C2=AE"<?==?UTF-8?Q?bugs@p?= =?UTF-8?Q?rofebox.com>?=

What is happening? Any tip?

Thanks