h2ojunkie

What about sites that have years of embedded images already? Some of us have been storing those images on our servers for years now.
wool old/existing image proxy images we already have saved continue to work, or will all of those stored proxy image break on upgrade?

Chrome and FF both support it.  MS edge chromium engine will release on Jan 15th'ish. So about 60% of all web traffic is covered with loading=lazy right there (until safari adapts it). 
In addition, loading=lazy works intelligently in combination with traditional lazy loading scripts (they built it into the browser engine).  You actually get even better performance when using BOTH.   There's zero downside to including that attribute on all images and iframes in addition to the javascript version. You get the best of both worlds. 

Chrome and FF both support it.  MS edge chromium engine will release on Jan 15th'ish. So about 60% of all web traffic is covered with loading=lazy right there (until safari adapts it). 
In addition, loading=lazy works intelligently in combination with traditional lazy loading scripts (they built it into the browser engine).  You actually get even better performance when using BOTH.   There's zero downside to including that attribute on all images and iframes in addition to the javascript version. You get the best of both worlds. 

I was looking closer at the mod.  Would it be possible to just make a copy of each reaction and have the copies have different point values, and enable in different forums
Example 
Like +1 (standard "like" enabled everywhere but the off topic forums
Like +0 ( a copy of "like", but worth zero points and only enabled in the off topic forums?
Visually to the user they would look identical, but depending on the forum selected the +1 or +0 would be enabled.
This might be a PIA to manage the ever evolving list of which forums each reputation type is enabled/disabled for, but if there's no other option..could that work?

@h2ojunkie Yes, I think in this version it is possible, but there are two difficulties: 1. you need to ensure that the reactions do not overlap, otherwise users will see both versions of the reactions. 2. As a ban for the reaction, forum topics are available, and not entire sections, that is, with a large number of forum topics, this will take some time to configure reactions.
I'll see what can be done to prohibit whole sections, it will be more logical

@Dayton28 I will check the behavior of the plugin again and report the results.
@h2ojunkie No, at the moment, what you want is impossible, I will think about whether this is possible within the framework of the plugin in principle, or it will require excessive use of the database

I *believe* it works but can’t be sure as I don’t have this version to test, so unfortunately you better not take the risk.

Very good possibility. Thank you for bringing that up.  I've toggled over to Send Grid based on other feedback I've received from some of my forum-hosting colleagues and so far it seems to be sending emails.  I think you're right that the Classifieds emails were getting sent into an anti-spam black hole of some sort.
 

Your account was edited by me. User: same from here. PW: br ... k.com (email used here). Let me know if you want me to PM you with it.
Please guys, report issues in the Tracker. I'll take a look when I start to work in the newest version.

@Tracy Perry, a fix: http://www.sosinvision.com.br/ips4/index.php?/tracker/classifieds/price-captions-appearing-even-with-transactions-disabled-r297/
@h2ojunkie, fix for #1: http://www.sosinvision.com.br/ips4/index.php?/tracker/classifieds/orphan-rows-when-deleting-advert-main-screenthost-r299/
I'll check #3 to see if it's a core thing.

There is a plugin for vbulletin 3.X series called vbouncer.

It sets a return path for all emails sent out by the forums, then using a cron job checked that email for bounces daily and can take different actions such as turn off all email notifications for a user, or set them back to unconfirmed status depending on the number of bounces received in a specified time period.

I've used it for years on many different server configurations, and it really works very well. I would think it can't be that hard to port over to IPB.