Mailster - Email Newsletter Plugin for WordPress 4.0.9

-fully tested on WordPress 5.0
-fixed: missing icons in WordPress 5.0
-fixed: prevent tracking on test mails
-fixed: relative width attributes now preserved in the editor
-fixed: issues with wp_mail if reply_to is an array
-improved: better checks if wp_mail is defined by another plugin

• fixed: missing fallback on custom fields
• fixed: undefined bodyElement in editor.
• added: sub_query_limit to process subscriber query in chunks for very large subscriber base
• added: display count of selected subscribers on delete page
• added: test for wp_mail
• added: more date form options on export
• improved: Gravatar as source is no longer shown if the source is not Gravatar
• improved: wp_mail handling for third party plugins
• improved: raw header parser for wp_mail
• improved: external forms now embedded via dedicate URL
• improved: query on subscriber overview page
• improved: translated roles in conditions view
• improved: searching subscribers now highlights search term.

fixed: Max execution time error message pops up randomly on some servers.
fixed: issue with certain post types and multiple underscores.
fixed: PHP error on form duplication.
fixed: issue with nested embed styles.
fixed: smaller issues.
improved: query for location based segmentation.
added: mailster_get_post_list_args filter for static posts.
added: mailster_autoresponder_grace_period filter.