CheersnGears

Yes, it's actually done in my development version. I've added pictures anywhere they appear - pages records, blog entries, downloads files. I just have a few other items in progress that aren't complete yet (specifically Club Newsletters). The Club Newsletters are taking longer than I expected. I really want this done this coming week.

Your text is wrong. IPS standard for email tags is
*|unsubscribe|* Note the use of vertical lines instead of brackets.
 
No. Newsletter content is generated once and only once, at the start of distribution. All recipients get identical content. If I changed this logic, it would eliminate the ability to do bulk mail, which means I'd have to send the newsletter one email at a time. That would be a disaster.
Club content is not yet supported, but it is in progress. That being said, users will never receive newsletters from "just the clubs they are in" for the same reason as the "unread" question. I am working on allowing Club owners to create their own newsletters, so each club would have its own newsletter that could be sent out. There are no plans for a combined club newsletter.

Yes, it's on my list of things to do. Application sweep is coming soon.

I can answer that one,... it doesn't work using the test distro button.  What I do is create a test distro member group with myself as the only member and send to that. 

Thanks,I have added this to our internal tracker.
You can expect by end of next week a brand new version with this and the feature requested by @Koper74

This appears to be breaking Https by showing mixed content.  Can you update the url to request the https version instead of http version? I've disable this plug-in for now, though I really like it.

I don't have any integration with Clubs at this time. I would like to, and it's something I plan on adding, but it's not there yet. 
I have a whole list of features I've been meaning to add to this app. In about 2 weeks I plan on doing a sweep and adding in as many as I can. That includes clubs integration (and things like Club newsletters).

10 days might be fine depending on how often Google visits your site.
Again, the frequency that Google visits your site has nothing to do with the sitemap.
In 4.3, we have added the lastmod timestamp, and added a button to rebuild your index from scratch.
Also, just double check your forum and topic permissions. Remember, if a guest cannot see the page, then Google cannot either.

We've added the timestamp into the sitemap and we're looking to add a tool to quickly rebuild the sitemap on demand.

That's fantastic! I (obviously) wasn't aware of that and it changes a lot of things for me and probably the original poster too.  Thanks

That's fantastic! I (obviously) wasn't aware of that and it changes a lot of things for me and probably the original poster too.  Thanks

It sounds like the Inactive Members app would be really good for this. It will send an email with no other advertising in it and it can be a simple "Hey, you've gone stale. Click here to log in and reactivate your account", and if they don't respond then it can move them into another group making them immune to emails. 

I have been a long time user of the app, so I can jump in with some answers.
If you have these members already separated in groups somehow, then your life will be substantially easier.  You can tailor newsletters to only send to specific groups.  This also answers your point about Banned members.  Just make sure your newsletter doesn't point to them.
Yes, easily, and if you have multiple calendars, you can do a seperate newsletter for each.
Yes, you can base it on number of views and number of replies, cut off for how old it is.
I don't have downloads, but it works in Commerce.
You can do any manually added content you like.
It is under manage profile - Newsletters.  
 
You would need to setup a new Newsletter to default to no-one and then people would need to opt-in manually.  I don't see anywhere in the app that recognizes that field in IPS. Headstand can correct me obviously.
See above, probably not.
You would probably need an app to move users into a group after their account has been stale for more than a year and then cut that group out of all distro lists.  I use https://invisioncommunity.com/clients/purchases/58978-inactive-members/ and it works well.
As the Opt-in during registration does not seem to integrate with this app, I would say this isn't possible. They would need to opt-in to each newsletter. Again, if I'm wrong Headstand will correct me.   It would be a nice feature that the main Opt-In for bulk emails automatically subscribes the user to the default newsletters for their group membership.
Hope this helps.  

1. At the moment, it's only filtered by group. Club is a good idea.
2. No. I've excluded all of that, intentionally. Each newsletter issue is generated once, and the same text is sent to all recipients. 
Although.... perhaps I should look into allowing Club Administrators to set up their own newsletters. That would be a nice addition.

Is there anything I need do when switching from Sparkpost to SendGrid?

On that roadmap can you put a spot to move users into a different user group? That would be extremely helpful.

If you haven't purchased already, I highly recommend this app. Great support from @HeadStand

If you haven't purchased already, I highly recommend this app. Great support from @HeadStand

That assumes they want to come back and update. I may not want to fully block, but instead want to just restrict from certain areas.  Doing so leaves them the ability to PM an admin if they're having e-mail troubles (yahoo and aol frequently block).   If they marked an email as spam, that should move them into a different group entirely. 
It also gives me the ability to do cleanup.  If they bounce and get moved into that group, I can do a filter to see if they have any content items.  If their content count is zero and the account is over a year old,  then I would just delete the account entirely.  I send birthday and holiday emails not because I'm particularly jolly, but because I want to see if the email addresses are valid.   Having bounced users moved into a group helps me keep the user database tidy.  

I discovered the issue.. it does not work using the test button, but does work when actually sending through the distribution routine.  So it was my lack of understanding of how it was designed rather than an actual error. 
Edit: I do wish I could format the link to something more pretty

unsubscribe is still not working

A suggestion for this app, please add an unsubscribe setting for newsletters in the admin panel under the member when viewing. The only way to unsubscribe a member now is to login as them. Maybe add your app into the tabs for member management?

If I'm working on a long article or post that has multiple links and I accidentally click one of those links while I'm trying to edit it, the editor often has not yet saved any draft input yet and my whole article gets wiped out.
I just lost about 45 minutes of work this way and this has happened to me multiple times.

Something still isn't right.  
I just went to make another reply to a thread and a post of mine from 3 hours ago (and a 3 posts ago) came up in the editor box.

+ 1 for me. I miss this feature. Xenforo had it.