rebraf

In theory it's possible, but out of curiosity - would you actually be launching a "drip campaign" or is your interest in just reaching out to them once to get more information? I would assume if someone is intentionally deactivating their account you're not intending to continuously email them and it would be a one off email. To that end, it might make more sense if the author of the addon you linked to just added support to send a follow up email to their application instead?
The nature of drip campaigns means it wouldn't make much sense (to me at least) for a user to "unsubscribe" from the campaign, however it is indeed directly tied to the "Send me news and updates" user preference. If a user turns that off, they won't receive drip campaign emails.

I've uploaded a new version which adds triggers for
First album creation First blog creation New club creation I am going to consider the product expiry request a little further before digging in, as it has implications different from those other points (e.g. you may only want to initiate the campaign when certain products expire rather than any product). It's just a bit more complex so I want to gauge demand before diving into that bit.

When any of the selected triggers occur the campaign will be assigned.
Yes, you visit the user's profile in the AdminCP, then scroll down and look at the bottom left hand corner of their profile. You'll see which campaigns the member is a part of, and be able to add the member to new campaigns, cancel existing campaigns, or restart the campaign.
If you have a user on "Campaign A", they cannot be added to "Campaign A" again. You can cancel the campaign if you wish to stop it, or restart the campaign if you wish for the user to start over for some reason. In practice, you would typically only want to send a series of emails to a user once however, so this shouldn't be a major limiting factor in real world use.
If you disable the campaign it will be stopped for all users (however their progress will be remembered in case you wish to reenable the campaign later).

A campaign can be just a single email if desired.

There shouldn't be any negative performance impact on high traffic boards, no.
A campaign can be initiated by current activity, but the emails are sent via a task.

Sure, those things should be doable and I'll take a look. Might as well include "first post" as well in that list.

This is the support/feedback/etc. topic for
 

1.2.0 has been submitted which adds the bulkmail-style tag support, as well as an option to trigger a step immediately instead of requiring at least a one day wait period.
Further - the code to initiate a campaign instance has been better abstracted to make it easier for third parties to integrate if they wish to do so.

I've uploaded a new version which adds triggers for
First album creation First blog creation New club creation I am going to consider the product expiry request a little further before digging in, as it has implications different from those other points (e.g. you may only want to initiate the campaign when certain products expire rather than any product). It's just a bit more complex so I want to gauge demand before diving into that bit.

This is the support/feedback/etc. topic for
 

Just purchased! Looking forward to setting it up.

I've uploaded a new version which adds triggers for
First album creation First blog creation New club creation I am going to consider the product expiry request a little further before digging in, as it has implications different from those other points (e.g. you may only want to initiate the campaign when certain products expire rather than any product). It's just a bit more complex so I want to gauge demand before diving into that bit.

Sure, those things should be doable and I'll take a look. Might as well include "first post" as well in that list.

I've uploaded a new version which adds triggers for
First album creation First blog creation New club creation I am going to consider the product expiry request a little further before digging in, as it has implications different from those other points (e.g. you may only want to initiate the campaign when certain products expire rather than any product). It's just a bit more complex so I want to gauge demand before diving into that bit.

When any of the selected triggers occur the campaign will be assigned.
Yes, you visit the user's profile in the AdminCP, then scroll down and look at the bottom left hand corner of their profile. You'll see which campaigns the member is a part of, and be able to add the member to new campaigns, cancel existing campaigns, or restart the campaign.
If you have a user on "Campaign A", they cannot be added to "Campaign A" again. You can cancel the campaign if you wish to stop it, or restart the campaign if you wish for the user to start over for some reason. In practice, you would typically only want to send a series of emails to a user once however, so this shouldn't be a major limiting factor in real world use.
If you disable the campaign it will be stopped for all users (however their progress will be remembered in case you wish to reenable the campaign later).

There shouldn't be any negative performance impact on high traffic boards, no.
A campaign can be initiated by current activity, but the emails are sent via a task.

Sure, those things should be doable and I'll take a look. Might as well include "first post" as well in that list.

This is the support topic for my Old Topic Warning plugin.
 

I've written an application to introduce hCaptcha support.
 

I've put up a demo here to test: http://rebraf.online/index.php?/gallery/
My server has been acting up a bit today, so apologies in advance if you hit any errors.

This is the support/feedback/etc. topic for