Environment variable for amavis subject tag

[elbracht]

Ref: #589

Environment variable to change the amavis tag sa_spam_subject_tag outside the container .

[tomav]

Hi @elbracht, don't forget integration tests.

[elbracht]

@tomav do you have an idea why I can’t use a string as environment variable? If I use a number as environment variable in Makefile it works.

Works:

-e SA_SPAM_SUBJECT=10.0 \

Don’t work:

-e SA_SPAM_SUBJECT="SPAM: " \

[tomav]

Still 2 errors in this build. How can we move forward?

[elbracht]

@tomav I can’t use a string as environment variable to update the $sa_spam_subject_tag in start-mailserver.sh. With a number or a fixed value as environment variable it works.

number (Makefile):

docker run -d --name mail \
...
-e SA_SPAM_SUBJECT=10.0 \

fixed value (start-mailserver.sh):

sed -i -r 's/^\$sa_spam_subject_tag (.*);/\$sa_spam_subject_tag = fixed value';/g' /etc/amavis/conf.d/20-debian_defaults

[tomav]

The error is here

[elbracht]

@tomav I know that the test failed on this line but this is not the problem.

I think the problem is that the environment variable is not passed to the start script start-mailserver.sh (here).

Or the script doesn't write the variable to the config file (here).

[tomav]

I have an error with sed when trying to run the line for subject tag configuration.
This seems to work better:

sed -i -r 's/^\$sa_spam_subject_tag (.*);/\$sa_spam_subject_tag = '"'$SA_SPAM_SUBJECT'"';/g'

Let me know if it works for you.

[elbracht]

@tomav Nice! 👍

Now the local tests have been passed.

[tomav]

Here we are!

[jholster]

It's not clear for me how to disable the subject rewrite entirely. If SA_SPAM_SUBJECT is empty/undefined, it seems to default to ***SPAM***. I would like to keep my subject unchanged, because I'm moving spams to separate folder.

[johansmitsnl]

@jholster maybe add a " " space in the variable might fit your needs.

[jholster]

@johansmitsnl Tried that, didn't help, maybe the configuration parsers trims the lines? Anyway, sounds like hack. Can we additionally have SA_ENABLE_SPAM_SUBJECT_REWRITE boolean variable?

I think it's very common case to move spam messages into separate spam folder. Once in a while I skim through my spams and move false positives to inbox/archive folder (to teach SpamAssassin). But the moved messages will have "SPAM" in subject line forever, which is kind of ugly.

[elbracht]

@jholster The following environment variable should solve your problem:

-e SA_SPAM_SUBJECT=undef

[jholster]

@elbracht Thanks, that finally solved the issue. If anyone else wonders how the .env parser distinguish between undef(ined) and "undef" – it does not, "undef" is just a magic string, see here.