To send mails in our projects most often we use Oracle Cloud Email Delivery Service. From official OCI Email Delivery description you can find: "Oracle Cloud Infrastructure Email Delivery is an email sending service that provides a fast and reliable managed solution for sending high-volume emails that need to reach your recipients' inbox. Email Delivery provides the tools necessary to send application-generated email for mission-critical communications such as receipts, fraud detection alerts, multi-factor identity verification, and password resets." ... sounds good ? yes and works good as well ; ) Buuuut two weeks ago I found some issue according send mail to multiple recipients. All multiple recipients mails stucked ! After few minutes of investigation I found a reason. OCI Email Delivery Service accepts only coma as a recipients separator without any other char. To fix it I prepared small function which parses string containing email addresses and retur