How to derive Gmail message ID

[pratham1002]

I want to use the googleapis/gmail library to send emails through my gmail account. I also want to store the message-id in order to send follow-up emails using references.

However, the id returned by the library does not match the message-id in gmail -> view original email.

Library returns:

id:
1872208dcc053b54
threadId:
1872208dcc053b54

What I see on gmail

How do get the message-id as seen on gmail when sending an email?

[Zaidtech]

Try using Regex to extract it!