Add alternative smtp server domain
Right now we can only use your services by pointing to the "mailtrap.io" domain.
The problem is that many mail-related software assumes that you want to connect to the MX records of the domain if they exists, no to the A records.
Understandably, "mailtrap.io"'s MX records point to google's servers to handler your own company-related mail.
My proposal is thus for you to maintain an alternative name, such as "smtp.mailtrap.io" or "sendto.mailtrap.io" or whatever you feel works best. The important part is that such domain would NOT have any MX records, thus preventing the aforementioned issue.