Odd message when making post (to existing thread)

Several times in the last week or so after finishing a post to an existing thread I get a very odd message (see below). I was not attempting to send email - possible explanation that the forum failed in its attempt to send a notification to those requesting notifications of new post to the thread. Rather disconcerting
Gigabyte Aorus GA-AX370-Gaming 5 M/B; AMD Ryzen 1700X; 16gig RAM; 2 x 500 gig Samsung 970 EVO PCIe NVMe, 1 x 250 gig Samsung 960 EVO PCIe NVMe drives + other drives (Windows 10 Pro 64)
Gigabyte Aorus B360 Gaming 3M/B, Intel i5 9400; 16gig RAM; 1 x 500 gig Samsung EVO Plus PCIe NVMe + 1 x 250 gig Samsung 960 EVO PCIe NVMe + other drives (Windows 10 Enterprise 64)
Gigabyte Aorus H370 Gaming 3M/B, Intel i5 9400; 16gig RAM; 1 x 500 gig Samsung EVO Plus PCIe NVMe + 3 x Kingston HyerX Fury 240gig RAID 5 + other drives (Windows 10 Enterprise 64)
Synology DS414 NAS 4 x 4TB WD Red HDD

Happened again today! Probably no point in posting the image. In this case the post was the first one made in response to an initial post in the thread.
So, whatever the problem, it is not yet fixed!
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Gigabyte Aorus GA-AX370-Gaming 5 M/B; AMD Ryzen 1700X; 16gig RAM; 2 x 500 gig Samsung 970 EVO PCIe NVMe, 1 x 250 gig Samsung 960 EVO PCIe NVMe drives + other drives (Windows 10 Pro 64)
Gigabyte Aorus B360 Gaming 3M/B, Intel i5 9400; 16gig RAM; 1 x 500 gig Samsung EVO Plus PCIe NVMe + 1 x 250 gig Samsung 960 EVO PCIe NVMe + other drives (Windows 10 Enterprise 64)
Gigabyte Aorus H370 Gaming 3M/B, Intel i5 9400; 16gig RAM; 1 x 500 gig Samsung EVO Plus PCIe NVMe + 3 x Kingston HyerX Fury 240gig RAID 5 + other drives (Windows 10 Enterprise 64)
Synology DS414 NAS 4 x 4TB WD Red HDD

Hi all!
The issue with notifications is still under investigation - reported this error message!
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Best regards,
Ekaterina Surkova | Forum Moderator
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