You can connect your Sendgrid account to Respona using IMAP/SMTP.
Please follow this process:
In SendGrid:
On the Email API tab, select Integration Guide and then the SMTP Relay option.
Create an API key for sending emails by clicking the Create Key button.
Copy the generated key (you will need it to configure the integration in Respona).
In Respona:
In your Respona account, navigate to the Email Accounts tab of the Account menu.
Click the + Add email and select Other providers.
In the Sender Email field, enter the email you have connected to SendGrid.
In the Sender Name field, enter your full name.
SMTP settings:
Set the SMTP Username to apikey as a standard user name (please enter the text "apikey" and not the actual API key you copied).
In the Password field, enter the password you copied earlier in your SendGrid account.
In the SMTP Host field, enter smtp.sendgrid.net
In the SMTP Port field, enter 465 (or 25)
IMAP settings: In the IMAP Username field, enter the email address you want to use to receive replies.
Create an app password in your Gmail account, and enter the app password in the Password field.
In the IMAP Host field, enter the address of the IMAP server (imap.gmail.com for Gmail accounts).
In the IMAP Port field, enter the port of the IMAP server (993 for Gmail accounts).
