Add API endpoint for accepting email
Some hosts, such as GoDaddy, block all SMTP ports, or don't allow using an SMTP server other than their own. A lot of mail services, such as Mandrill, Mailgun, Sparkpost, etc. provide both an SMTP server and a REST API for accepting email. Providing a REST API endpoint for accepting email would allow users on such restrictive hosts to be able to use mailtrap, even when they can't use the SMTP server.
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Anonymous commented
GoDaddy requires their hosted servers to send through their own SMTP relays. "Your server must send mail using our relay servers." (https://www.godaddy.com/help/find-your-email-relay-server-122).
Because of this, there is currently no way to use mailtrap on GoDaddy host servers (without, of course, upgrading to the Bee-Trap plan, as you mentioned).