Originally Posted by brandonstills

Not sure if they support adult but the common names I hear are MailChimp, SendGrid, Mailgun.

https://support.sendgrid.com/hc/en-u...-in-my-emails-

Looks like Sendgrid is implying it's fine as look as there isn't anything explicit in the email. Can you make the email PG and then send the link to the adult version on your site?