Subject: Scheduled Website/Server Maintenance Completed | [COMPANY_NAME]
Dear Customer,
We’re pleased to inform you the maintenance task has successfully completely and all systems are back online.
During the maintenance we performed security audits and updated all our systems to ensure optional performance.
We thank you for your patience during this time.
Please write back to us if you have any questions.
Regards,
[YOUR_NAME]
[YOUR_POSITION]