Need Bullet Proof VCALENDAR set up for email invites

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
Having issues with our VCALENDAR email/phpmailer from our web application. It is unreliable and seems to not work well with corporate gmail. Need to have the email invite to be bullet proof on all emails and mobile devices. Open to a code check and suggestions on recoding.

Skills required:
PHP, Software Architecture
About the employer:
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