BDAT not supported

[isg8]

Getting this error for some messages

Your message contains invalid characters (bare line feed characters) which the email servers don't support.

additional information is referencing BDAT command. Can't seem to find any references to this in the code or existing issues. Any suggestions?

"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."

[phires]

At this point, go-guerrilla does not support BDAT / Chunking (RFC3030) and is not advertising it in the EHLO phase.
If a sending server is trying to use Chunking against a go-guerrilla server it is not working in the standards.

We might implement Chunking at some point, but it can be a quite complex issue.