• After the update to 1.5.13 I started getting the following error:

    Notice: Undefined index: region in /home/…/public_html/wp-content/plugins/mailgun/includes/wp-mail-api.php on line 117

    I am using a multisite install

    I am managing settings through wp-config.php

    I did not have region settings in there

    Once I added region settings in there everything worked perfectly.

    Perhaps you can look into this.

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