(How to) Roundcube e-mail filter to remove e-mails with attachments

[vvenet]

Dear Support Team,

How to setup a filter in Roundcube, that will detect and delete incoming e-mails with a ".gz" attachment?
Some backgroud: I am experiencing annoying incoming fake e-mails which all have an attachments with a " *.gz " extension.

I know it can be done, but how? I used Google to find answers. One solution I found is here: https://jensknipper.de/blog/roundcube-sieve-filter-attachments/ , but I do not know how to implement it. (In this solution a zip-file is mentioned; in my case it is about a gz-file.)

I hope you can give me the proper instructions how to do setup a filter in Roundcube who will detect and delete incoming e-mails with a ".gz" attachment.

Kindly awaiting your reply. 🙂