An invalid mail header was specified. An empty string or null cannot be set for the mail header key or value. (adapter name = aa....aa, method name = bb....bb)

aa....aa: Adapter name
bb....bb: Method name

Description

The specified mail header is invalid. An empty string or null cannot be used for the mail header key or value.

(S)

Stops processing.

(O)

Make sure that an empty string or null is not specified in the mail header key or value.