SMPT and IMAP injection

Hi,

is this client implementation secure against SMTP and IMAP injection?
https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/07-Input_Validation_Testing/10-Testing_for_IMAP_SMTP_Injection

I had a qucik view at the code but could not find any sanitizing methods.

Thanks in advance