False error message

When I reply to an email, very often a page called OPERATIONS opens, with the following content :
<<[my email address] : Connecting to [my email address] failed [time].

[SMTP] An attempt to connect to [my email address] failed. This could be caused by temporary server unavailability or incorrect settings. Do you want to check the settings?

Open account settings Ignore >>

Opening account settings does not reveal any suggestion for improvement, so I click on IGNORE. Then the OPERATIONS window changes to say ‘There are no errors’ and my reply gets sent and received…

Surely this is time-wasting and should be avoided. HOW can I right this ?