Problems with Special Characters in Link on Emails

Hello,

I am using the Sendgrid API to send event invitations to my users. The email contains a link that lets them add the event into their Google Calendar. The link pulls certain information from an event listed on my WordPress site such as event name, ticket information, location and that is in php in my plugin file.

On the email it converting special characters such as – and & to #038; and & when I deactivate WP Mail SMTP the link works fine.

Is there anything I can do to fix this?

Thanks!