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Hey,

What do you mean about the headers? I did indeed send both of the headers. The first Pastebin link is the header of the emails that are being sent normally. Everything in Joomla and Kunena except the "report post" feature is sending emails this way. The second Pastebin link is the header of the email that is of the "report post" email. You can obviously see where this does not match the other header and is being sent via PHP Mail (SiteGround IP) rather than SendGrid's IP.

I also sent the screenshots of Joomla's configured settings to show that everything is configured to go through SMTP SendGrid and not PHP Mail, which is what is happening on that second email, hence why it is being sent with a SiteGround IP and being marked as spam by the end client inbox.

This seems to be an issue with Kunena and not the hosts/APIs. However, if you have something you can recommend me saying to them, I could try to ask them about it?

Thanks.

Yes it's possible. First go in the Kunena configuration (tab) Users and set the subscriptions options so as you want.
Then go to the Kunena user list, mark all users and add the categories for subscriptions.
Alternative you can try this plugin for auto subscriptions: extensions.joomla.org/extension/auto-subscription-for-kunena/
But you should to mind, if you add the subscriptions without consent of your members then it's spam.

All kunena mails are send by the joomla email integration.
If the mails are going to the spam folder ect, then you need to recheck your dns setttings, like the spf ect.

Also you can be on a black list, because sending to much emails at once.

You don't need manipulations in the database, and this guide is already more than 5 years old. Go in the backend to Kunena -> Trash and purge the items.

Hi why dont you add this extension for protecting Kuena forum Version 3.2.1-PRO - 2019-05-12

kubik-rubik.de/ecc-easycalccheck-plus

Here the same thing happens. It is necessary to apply a good captcha.

Hi

I just wonder if other Kuena forum have problem now like SugarCRM?

suitecrm.com/suitecrm/forum/suite-themes

many Chinese spams there

I use Cleantalk plugin for Joomla which has been a godsend and really effective on keeping out spam and such. It costs about $8 per year for 3 websites, which makes it a no brainer budget wise. In the past year I think we have had maybe 3 spammers get through and no bots. I have a fairly busy site with about 7,900 registered users, mainly on the forum. I don't get a kickback and am not affiliated with them, but do use the product on several sites with great results.

www.Yamaha-Enduros.com

Hi,
This is how I protect (for now successfully) against spammers:
1. protect joomla user registration with reCaptcha (invisible): this will 'force' the spammers to do a manual action when registering
2. I have (my own) plugin ochStopDMR enabled (extensions.joomla.org/extension/ochstopdmr/): This will stop spammers from registering with Disposable Emails
3. activitate users by sending activation link they need to click
4. install R-AntiSpam (extensions.joomla.org/extension/r-antispam/): heuristics based spam detection for Kunena > works miracles and has an occasional false positive that can be easily corrected / learned from
5. set reCaptcha (invisible) for anonymous users when posting in Kunena
6. set a limit to the amount of URL's a post can have

This setup keeps my sites clear from spam accounts, and in the categories where visitors can also post they are prompted with the recaptcha and R-Antispam will catch the smart ones.

I host my sites with SiteGround, they automatically block IP-addresses they are known to try to hack / spam a site. They also use the experience from all their hosted sites, not only from my site. When they introduced this feature, directly the ddos / bot-logins where minimized to 0. I think the blocked spam-bot networks that are trying to login are potentially also the bots that send spam. So although I have no prove my gut feeling is that this will also limit the amount of spam... but: Kunena is also hosting at SiteGround and here on the forum is the daily amount of spam messages also worrying.

There is a very simple solution that no extension required, just nothing, only native Joomla.

First delete from Joomla users the bots.

Then you can just enable in your Joomla backend that an admin (you) must approve and activate the user when any user account is created.

So the bots with this way they can't post anything because when they automatically register to your site they must first be approved by you to be activated so to can proceed to login and post.

So if you see that strange name of users have been created (for example john5558886398fddf) then you don't enable this user at all and you delete him also from Joomla users and you will have no posts from bots. Also if you bored after some days to manually enable the users, you can deactivate it and again the registration will become again automatically, so if you see again bots , then you re-enable for some time again the admin approved registration.

Give it some days and I think you'll be fine if the bots see that they cannot login automatically and probably they will stop trying after some time.

And of course to be sure, check your website for any outdated extension / malware etc to be sure you are clean and up to date.

I am sure they are "bots" because they can post more than 37 thousand posts with random topics in about 3 days, and spreaded in all subforums of my Kunena.

600 sec are 10 minutes. So can a user send maximum 4320 posts in a time period of 3 days, not 37 thousand.
I see it here on k.org. Some spam users post always the same quanity of 5 posts. Short time later comes the same spam from another user (also 5 posts) and so on. So I think, a post limit per day would not be helpfull.

Try this from the user Slacker recommended plugin, I hope for you, that it solves the problem.

You might fix this with phpmyadmin:
www.kunena.org/forum/k-3-0-general-quest...na-mass-delete-users

Use this extension to protect Joomla and Kunena from spambots. It has a mathematical problem:
extensions.joomla.org/extension/easycalccheck-plus/

Yes, you are right. I had already tried the option "permanently delete all posts of this user" when creating a new ban. But, this operation resulted in 500 error because this spam user has more than 30,000 posts, so Kunena cannot move them to trash either delete them permanently. At the end, I have to delete those spam posts MANUALLY, in many steps, with only about 200 posts for each single batch.

How many hours this will cost me to completely clear those spam messages? You can imagine that.

Yes, in principle you're right. There are to many steps for this option to do that if you have so many spam. But you can also prevent the problem by delete permanently all user posts during the ban. In the frontend "User -> tab New Ban" is this option available.
If you want, then create a topic for your sugestion here in this category please.