Relaying through our 365 tenant. Mail settings are configured as per https://support.office.com/en-us/article/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-office-365-69f58e99-c550-4274-ad18-c805d654b4c4 | Option 1.
"This error occurs when the email program or device used to create or send an email message adds bare line feed characters into the message. When bare line feed characters are included in a message, the SMTP protocol chunking feature is required to transmit the message between email servers. Chunking uses the SMTP protocol BDAT command, but the recipient’s email server doesn’t support the BDAT command.
To fix the issue, the sender should send the message using an email program or device that doesn’t add bare line feed characters to messages. Most modern email programs don’t add bare line feed characters."
How can I remove bare line feed characters from the email that UrBackup is sending so that my emails will get through to the recipient?