SMTB-781 — Incomplete value in MIME header
Named part of MIME header value was not found (see the header name and the original text in the parenthesis). This header is needed for correct proxy operation and the error cannot be recovered.
Header text will be reported in following SMTB-789 log message.
This error can occur while reading an incoming mail, or during initial configuration check (e.g. of MODIFY-HEADER items). In the former case, mail will be rejected. In the latter case, this error is treated as warning only - check whether this RFC violation is really needed.