dukati on "[Plugin: WP Mail SMTP] No verification code e-mail sent with SMTP"

Hi , if I use your plugin with Contact Form 7 email verification and with Verify Email for Caldera Forms my form is unable to send with smtp the e-mail with verification code, do you have any idea way this happen ? Do you have any solution to this problem? I thank you in advance for any help.

https://wordpress.org/plugins/wp-mail-smtp/