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What's the output of grep 173.0 /var/log/fail2ban.log and iptables --list -n | grep 173.0. ?

So it's a simple outgoing mail issue. Is the outgoing mail limit sufficient for the mailbox, domain and subscription? Is the outgoing mail port open, e.g. can other mail be sent through it? Are sender and recipient address formatted correctly? Only two entries in the maillog seem to be too...

It for sure doesn't have anything to do with Plesk. This is rather a PHP settings issue or might be linked to the Nginx proxy and its caching setting, depending on the URL that is used to receive the POST (e.g. whether it is treated as a static page or dynamic page). Without more information but...

Is the URL in Paypal configured correctly? They should show a log, too.

What's logged to access_ssl_log and error_log when the IPN is sent?

Name resolution might be turned of in /etc/my.cnf.

It has nothing to do with Plesk. This is purely a Wordpress question. Better addressed to WordPress Development Stack Exchange

The log excerpt shows no attempts to mail anything to GMail.

do NOT have direct access ...

Gee, that's not a "solution", that's a workaround at best. What are you gonna do once the number of requests against the website increases? ...

I think it needs to be reinstalled through Plesk installer. 1) Remove it 2) Reinstall it

O.k., not a problem. You are right, I am wrong. Good luck.

Your description points to either a hardware issue or an issue with the operating system itself. You're trying to blame it on Plesk in your previous post, but Plesk only takes what's in the system and offers an easy-to-use user surface to manage system services. If they install system services...

Great, you're almost at your goal. The reason for the issues here is that you have a script that runs way too long. Normally, website scripts run a fraction of a second. When you are doing uploads it might take longer, but for regular operations anything beyond a few seconds is too long. This is...