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emails not sending

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SuMo Bot
SuMo Bot
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Sending of message failed. Unable to authenticate to Outgoing server (SMTP) smtp.kingharald.co.uk. Please check password and verify the Authentication method in Account settings/Outgoing server (SMTP). Emails work ok for a while, then I get a few days of this error message and then it seems to fix itself. It's not working just now. How do I fix this?

Sending of message failed. Unable to authenticate to Outgoing server (SMTP) smtp.kingharald.co.uk. Please check password and verify the Authentication method in Account settings/Outgoing server (SMTP). Emails work ok for a while, then I get a few days of this error message and then it seems to fix itself. It's not working just now. How do I fix this?

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SuMo Bot
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I'm using Thunderbird. I'm thinking to change to Outlook. Hopefully that will solve any problems?

SuMo Bot
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Thank you so much for your replies. My emails still not fixed. I would like to phone them but there are no contact details.

SuMo Bot
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