I have multiple email accounts and as of right now I have over 35000+ unreal emails. If you use gmail and have a similiar issue, one way to mark all as read is to create filter. Log in to gmail, go to settings->filters and create a filter and under "Has the Words" put:
is:unread
Click away, you may get an error but just keep clicking okay. The final box will say "Also apply filter to XX matching conversations", click the box and walla.
is:unread
Click away, you may get an error but just keep clicking okay. The final box will say "Also apply filter to XX matching conversations", click the box and walla.
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