Windows 10: Windows Mail - Messages Stuck in Outbox and Multiple Drafts Created

I am using Windows Mail which I vastly prefer to Outlook however on one of my accounts I am getting sent messages stuck in the Outbox and multiple blank drafts created. The account is through my business domain provider.Restarting my computer allows the message to send but I have to manually delete 4-5 blank drafts when this happens.Any ideas on this issue and what can be done?Thanks

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Mail stuck in outbox

Hi! I am using Microsoft Mail Version 16005.14326.20858.0 and my outgoing messages keep getting stuck in the Outbox and numerous blank draft message pile up. Any suggestions?

 

Unknown message stuck in Outlook 2016 outbox

The last two days I've noticed when I start Outlook (I have Office 365) it tries to send a message but fails and error code 0x800CCC0F is generated (see screen shots). If I send an e-mail, the e-mail is sent but whatever is stuck also tries to send. Not sure how to correct this. I've run scans with Malwarebytes and Windows Defender and nothing shows up.

Here are some screenshots.

 

Message Stuck in outbox

I am also facing the same problem.. The message is stuck in outbox.. It dosent Delete, dosent moves to draft, when I try to view details of this message, nothing happens, if I try to send it, it fails and then when I try to move it to draft,
it just deffers and dosent move to drafts !!! The message memory is set to multimedia card... I
cannot format the card as it will delete my other messages as well !!! Please Help !!!