Can I send more than 50 emails using mail merge (MAPI = evolution)

I have a spreadsheet with approximately 110 email addresses, and I want to send a page document to all 110 emails. When it reaches 50, it terminates saying something along the lines of not wanting this to be spam related.

Where is this limit set; In LibreOffice or evolution? Can I increase the limit?

This is the error I get

<class ‘smtplib.SMTPDataError’>: (552, b’5.2.0 8uBCaPzbVpK8X8uFBatsaU message rejected’), traceback follows
/usr/lib/python3.4/smtplib.py:799 in function sendmail() [raise SMTPDataError(code, resp)]
/usr/lib/libreoffice/program/mailmerge.py:278 in function sendMailMessage() [self.server.sendmail(sendermail, truerecipients, msg.as_string())]