Provider to send email marketing adult content?

Like Michael is suggesting, get your own smtp server, however you should be aware that adult content will most likely attract more direct spam complaints to the hosting provider, and to many of these direct spam complaints can cause them to close your hosting account.
A good point. However, if you have a good relationship with your hosting, and they're happy to host adult content, you build your mailing list correctly, I don't see why there should be any problems.
Quiero enviar a los suscriptores a un foro 180,000 correos electrónicos, este será un problema para enviarlos desde una IP y con 0 reputación, ¿no crees?
I want to send subscribers to a forum 180,000 emails, this will be a problem to send them from an ip and with 0 reputation, do not you think?