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##### What behavior are you seeing?

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##### What operating system are you using?

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##### What version of Mailspring are you using?

(eg: 1.6.3 or 1.7.0 - this is shown in Mailspring's main menu.)

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##### Is the issue related to a specific email provider (Gmail, Exchange, etc.)?

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##### Is the issue reproducible with a particular attachment, message, signature, etc?

<!-- Try to provide an example as a file attachment or a screenshot. -->

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