MailWizz - Email Marketing Application 2.6.8

[ENH] - Allow emails starting/ending with dashes in the name part
[REM] - Reverted/Removed - Opens and clicks tracking will now exclude crawlers/robots
[REM] - Reverted/Removed - Opens and clicks tracking will now exclude Google Services. Configurable from Backend > Settings > Campaigns > Exclude IPs from tracking
[REM] - Reverted/Removed - Added "campaign_exclude_ips_from_tracking_google_ips_range" filter hook
[MSC] - Overall fixes
[UPD] - Updated composer packages

[ADD] - Beside "Campaigns abuse complaints" in customer area, we have added "Campaigns abuse reports" too
[ADD] - Added setting to decide whether the customer gets notified via email on abuse complaints or not
[ENH] - The "From" address used in delivery servers will now be unique across customers. No two customers can use same "From" address
[RMV] - Remove the X-Receiver and X-Sender headers which we added by default
[MSC] - Overall fixes
[UPD] - Updated composer packages

[ENH] - Campaign reschedule now uses mutexes and a control flag to prevent creating multiple campaigns instead of just one
[ADD] - Added ability for important transactional emails to fallback on system servers
[ADD] - Added ability to parse campaign custom tags inside the random content blocks