I run 2 websites, and their emails, on a VPS. I use Outlook for the email needs. Recently, I sent out 6 emails. 5 of them went through with the last one getting stuck in Outlook's Outbox. The error code I received, was: 0x80042109.
I am able to continue receiving emails but cannot send out any emails, since the error with the batch of 6 emails. I cannot seem to see any errors on the server and I have not changed any settings in Outlook. I have tried sending emails, via Outlook on differing devices to no success. I am able to use Gmail and Hotmail fine.
I have also changed Ports etc but, again, to no success.
As such, I am thinking there may be a problem with Plesk itself. Is there a way to check whether Plesk is experiencing problems at the moment?