I’ve seen that document already.
That only changes how the suffix is output in the subject line - provided you’re using the subject pre-pend option. , [Leave the case alone with the supplied patch. The default is to set the tag in the subject to lower-case.]
I’m not sure why this is confusing - I know that the current tag delimiter is “+” - I’d like to add an additional delimiter. [Or if that’s not possible, perhaps change the delimiter. Instead of using just “+” how about two different delimiters “+” and “-”.
I’m not sure how mailcow goes about handling the delimiters - I suspect it’s in postfix. I could probably directly change the postfix config - but that’s likely to get overwritten when updates are done, or postfix configurations are changed.
So, I’m asking how to do this so the change “works with the system” instead of just going out and directly hacking at the postfix config. [Even assuming the postfix config is where to handle it, which I’m not sure is correct.]