We are using AWS SES as our smtp for sending emails. We have been successful at sending emails without attachments, however we have not been able to send a pdf attachment. We are using the SMTPSecureSocket Authenticated on port 547. We have successfully sent attachments on other SMTP with other ports, but would prefer to use AWS SES.
We are receiving the following error message.
554 Transaction failed: Expected ';', got "x-mac-creator"
Any help would be appreciated.