This is an automatically generated Delivery Status Notification.
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipients has been delayed.
The reason for the problem:
4.3.2 - Not accepting messages at this time 421-'4.7.0 [18.104.22.168 10] Our system has detected an unusual rate of\n4.7.0 unsolicited mail originating from your IP address. To protect our\n4.7.0 users from spam, mail sent from your IP address has been temporarily\n4.7.0 blocked. Please visit http://www.google.com/mail/help/bulk_mail.html\n4.7.0 to review our Bulk Email Senders Guidelines. go9si25674943pbc.307'
This appears to indicate that Google's mail servers consider snap's SMTP server to be sending spam!
Has anyone else had any similar errors to this?