I have multiple emails from different clients that I am attempting to respond to. They contain no images or attachments, but every time I try to respond to them, Roundcube Webmail pops up an error message indicating that the email appears to be spam. Here is the error:

SMTP Error: [550] This message was classified as SPAM and may not be delivered

Here is an example of the email:

Hi REDACTED,

I can give you a $REDACTED USD discount if you purchase 3 units together.

Let me know if you are interested and I can provide you with a coupon code to use, or send you an invoice directly.

---
Regards,
REDACTED

Webstore:
http://REDACTED

Open a Support Ticket:
http://REDACTED
On 2015-10-01 04:13, CustomerSupport wrote:


Name: REDACTED
E-mail: REDACTED
Telephone: REDACTED

Comment: Hello i need good price for 3 units of

GSM-KEY Garage/Gate Opener - 1 x Relay, 2 x Inputs - AC Powered

from spain.



Thank you