Unsubscribe links seems to be clicked during processing

I have an issue where an article provider has agreed to let me publish their daily articles which they send out to their mailing list. In the emails mid article are single click unsubscribe links. I can’t publish these on my website or someone or something will click them. I replace them with a function replaceTextinTheContent
‘Click on this link to unsubscribe’ => ”, then add filter postie_post_before which appears to work fine but I actually found it unsubsubcribes me.

So I now have to delete the links in the email manually, forward to a new email address then ask postie to process it from there manually, rather than subscribe that end email address directly to the provider and have automated processing which I initially tried many times.

Do you have any idea what occurs during the process for this link click to happen, is it the convert urls to links option, I need to keep that on ideally? I can’t ask them to edit their unsubscribe links to have a second confirm option so need to find a solution my end if possible. Any ideas appreciated.

Thank you